Crash Dive 2 Manual

A single, stand-alone mission where you encounter a randomly-generated convoy.

Goal: Sink the merchant ships and escape. Or sink the merchant ships and the escorts, just to show how bad-ass a captain you are.

This is a great way to practice and gain experience without a lengthy time commitment.

A single War Patrol where you are loaded up with fuel and ammo and sent to your assigned patrol area.

Goal: sink as much merchant shipping as you can find before you run out of fuel or ammunition.

You may also receive orders for other side missions from COMSUBPAC while on patrol.

A lengthy series of war patrols, beginning with your first submarine command and playing out through the duration of the war as you work your way through the South Pacific toward the Japanese home islands.

Goal: Survive, bring your ship and crew home safe, and (as always) destroy as much Japanese shipping as possible.

If you want to play a customized Convoy or Patrol game, check out the Custom game menu.

It lets you create and save custom settings that affect your gameplay, from a simple random seed number down to the finest details of how many enemies you'll be facing and what kind of weather you'll encounter.

For quick settings, use the "Difficulty" drop-down near the top to instantly apply the default values for whatever difficulty you prefer; you can then modify them from that starting point.

You can hit the "Load" button in the Custom Game menu any time to load a previously-saved custom game. Or load "Defaults" to revert back to the default values.

If you just played a regular Convoy or Patrol game and wanted to try it again with some modifications, you can Load the auto-generated settings file called "Last Mission".

You can also instantly replay your last mission with the "Replay Last Mission" button on the main menu.

If you've created a custom game that you particularly like, hit "Save" to store it for later replays or further modification.

Any time you quit out of a mission, your game will be saved.

You can have one auto-saved game of each mode (Convoy, Patrol, and Campaign). This means that if you start a new Convoy mission, it will overwrite the existing Convoy save game file if you have one.

To continue any one of those saved games, just select "Continue Game" from the main menu, and choose which type. Only those modes that have a saved game file will be displayed.

If you have placed any additional saved games in your saved games folder (e.g. copied from another device or a duplicate of another save file) you can view them by selecting "View All" from the Continue Game menu.

The difficulty selection adjust a variety of factors in the game. You can adjust most of these however you like in a Custom game type.

Increase by difficulty level:

At Medium and above:

At Hard and above:

At Sim:

In this view, you can identify targets and line up torpedo shots. Drag left and right on the screen to pan your view left and right. Center your crosshairs on a ship to target it.

Your periscope has lenses that allow you to zoom in up to 3x, but can also be upgraded for further zoom levels.

This view is only available if you are submerged and your periscope is raised above the water; the "Periscope" button will always show whether that's the case:

Periscope raised above the water (blue line at bottom)

Periscope lowered below the water (blue fills above the periscope)

Note that your periscope can be raised, but still be below the water if your sub is deeper than its 60 foot "periscope depth".

When surfaced, the Bridge view replaces Periscope view. It is a wider field of view, and also lets you zoom in using a powerful pair of binoculars.

In addition to torpedoes, you can also aim and fire the deck gun from this view. Zoom in to use the binoculars' cross-hair reticle for more accurate aiming of torpedoes and deck gun shots.

You can switch to the Chart view any time, but when submerged below periscope depth it is your only view option.

Your sub: When you first enter Chart View, your sub will be at the center. You can always re-center on it by Tapping the Center View button:

Perception range: Portions of the map that are within spotting range will be in full color. Areas beyond that range will be desaturated and dull. Only ships and vehicles within this range (i.e. those that are visible to you) will appear.

Plot Marker: Tapping anywhere on the chart will set down a plot marker, which will display:

  1. The distance to that point, in yards or nautical miles;
  2. The depth at that point, which may be more or less accurate depending on how out of date the charts are;
  3. If your sub is moving, the estimated travel time and estimated time of arrival ("ETA") to reach it.

Tap the plot marker to start your sub turning to face that point. You can also double-Tap anywhere on the chart to place a marker and immediate turn toward it.

Torpedo track: The track that a torpedo will follow appears as a red/green line with time markers at intervals along it. You can use those to plot out how far a torpedo will travel in a certain amount of time, or conversely, how long it will take a torpedo to reach a certain distance.

Fired torpedoes will quickly rise to the surface, but the deeper you are, the farther the torpedo will travel before surfacing. The red portion of the line shows that distance; use it to make sure your torpedo won't pass underneath an enemy ship!

Note that if there is anything blocking your torpedo's path, the torpedo track will end at the point where it would hit the obstacle.

Enemy ships and planes: Any enemy ships and planes that are within visual range (when your sub or periscope is above water) will appear on the chart view.

If you don't have visual spotting (your sub and your periscope are submerged), then nearby ships will still appear thanks to the hard work of your sonar operators. But sonar can't detect aircraft, so you won't see any indication of them on the chart.

Targeted ship: Tap any enemy ship to target it. This has the same effect as centering it in the Bridge view: Its info will be displayed on the screen and the TDC will calculate a torpedo solution to hit it. The targeted ship's estimated track will also be shown as a yellow line with time markers showing where it will probably be in the future. Only one ship can be targeted at a time.

Radar: If equipped, your radar's range will appear as a green line, continuously sweeping in a circle around your sub. Enemies in radar range (that aren't hidden behind terrain) will appear as a collection of radar-reflected "blobs".

Whether you're in Bridge, Periscope, or Chart view, at the lower left are buttons for controlling your current view.

Center View: In a first-person view, snaps the camera back to the front of your sub. In Chart view, centers the chart on your sub.

Zoom In: Zoom the current view in.

Zoom Out: Zoom the current view out.

When surfaced, you can man the AA gun by Tapping the button. In this view, most of your HUD is turned off to allow for the best possible view of enemy planes.

To exit AA Gunnery view, Tap the close button at the top right.

Go here for more on AA Gunnery.

When in any first-person view (Periscope, Bridge, or AA Gunnery), your current view angle is displayed at the bottom of the screen.

This shows the angle of the direction you're currently looking as:

  1. Relative to the bow of your sub (the first number) as + or - 180 degrees
  2. Absolute to the world (the second number) as 0 to 360 degrees.

If you prefer the relative angle to be displayed as 0-360 instead of +/-180, there's a checkbox to change that under the Options menu.

You "drive" your sub using a separate control for each axis: Forward/back, left/right, and up/down.

Your rudder controls the left/right rotation of your sub.

Tap and hold the left or right arrow button to rotate your sub in that direction.

Or if you double-Tap a rudder button it will toggle on, and your sub will turn that direction until you Tap it again (or the opposite rudder button).

In Chart View, double-Tap anywhere on the map (except on an enemy target) to set a target point that your sub will rotate towards.

At the bottom right of the screen is a compass showing the relative angle between your bridge or periscope view (the green cone) and your sub's heading (the black capsule).

Tap the compass to rotate your sub so it's aligned with the view angle.

The faster your sub is moving forward or backward through the water, the more effective your rudders are, allowing you to turn more quickly.

Damage to your Rudder will reduce your turning speed. If the Rudder system is destroyed, you will be unable to turn at all.

The forward/reverse speed of your boat is controlled with the 5 throttle buttons on the right: Reverse, Stop, Ahead Slow, Ahead Full, and Ahead Flank.

Your current speed is displayed just below the throttle controls.

Your sub's top speed when surfaced is 18.5 m/s; half that when submerged.

When surfaced, diesel engines propel your boat, as well as recharging your batteries if necessary.

When submerged, your sub switches to battery-powered electric motors, which draw power from a bank of batteries. When fully charged, you have enough battery power to run at full throttle for about 50 minutes.

Damage to your Engines will limit your maximum throttle setting when surfaced; likewise, damage to your Motors will limit your max speed when submerged.

Damage to your Batteries will reduce your stored electrical power, limiting the distance you can move while submerged.

Your sub's depth is controlled with dive planes and ballast tanks. Use the combination depth gauge/controls to set a target depth for your sub; it will continue to try to ascend or descend until it reaches that depth.

Tap the Up arrow (1) to set a shallower depth target in 50-foot increments. Press and hold it to tell your sub to surface.

Tap the Down arrow (4) to set a deeper depth target in 50-foot increments. Press and hold it to set your target depth to the maximum for which your sub is rated.

Your sub's depth is always shown as the middle number (2). If you exceed your boat's maximum rated depth, the background will be red.

For more accurate depth control (1-foot increments), Tap the current depth value (2) and drag up or down.

The target depth will always be shown on the arrow for the desired direction. Your current depth is displayed between the two arrows.

The faster your sub is moving forward or backward through the water, the more effective your dive planes are, allowing you to change depth more quickly.

Damage to your Dive Planes will reduce your dive/ascend speed.

A thermocline is a layer of ocean water where two different temperatures meet. Sonar pings tend to bounce off of that layer; you can use this to you advantage by hiding beneath a thermocline layer, making your sub harder to detect.

The layers are displayed as a section of blue on your depth gauge. If there is a blue line at the bottom of the gauge, then you are above the thermocline layer (and it will have no effect). If the blue line is at the top of your gauge then you are completely beneath the layer, and it will provide maximum camouflage for you. If you are currently in the middle of the layer, your depth gauge will be filled blue, and the effect of the layer on sonar will increase as you go deeper.

Beginning an ascent or halting a dive uses a small amount of O2 to blow water out of the ballast tanks.

Displayed just below your current depth is the depth of the sea floor under your keel. The background color of this indicator will shift from green to red as you get closer to running aground. If you are aground or "bottomed" (sitting on the sea floor), then the sounding depth will be "X"d out:

While the maximum rated depth of your Gato-class sub is 300 feet, you'll find she's actually capable of going much deeper. But if you push her too far down, eventually you'll find her "crush depth", at which point you will begin to rapidly take severe damage and flooding as the high pressure of the deep water squeezes you mercilessly.

Once that starts happening, you'll only have a few seconds to reverse your dive and get back above your crush depth before your boat implodes!

Also be aware that loss to your sub's overall Hull Integrity will reduce both your max rated depth and crush depth.

For navigation, you can set a series of waypoints that your sub will follow.

To add waypoints, go to Chart View and Tap the Waypoints button:

This will open up the waypoint control menu, with the Add Waypoint ("+") and Delete Waypoint ("-") buttons:

Tap the "+" button to toggle Add Waypoints mode. Once enabled, when you Tap in the chart view it will add another waypoint onto the end of your path.

Note: You can not add a waypoint that would cause your sub to run aground or enter a minefield. If you try, you will hear an error sound.

Tap the "-" button to toggle Delete Waypoints mode. Once enabled, when you Tap on a waypoint, that waypoint will be removed from your path.

Tap the "0" button to Delete all Waypoints.

Tap the "Fast Forward" button to Fast Travel to the last waypoint.

Tap the Waypoints button again to close the waypoint control menu.

When not in Delete Waypoints mode, you can Tap on any waypoint to see the total distance to it (travelling the path to that point), travel time to reach it (if your sub is moving), and the depth sounding at that point.

At any time, you can Tap and drag any waypoint to alter your path.

Note: You can not drag a waypoint so that the path from the previous point would cause your sub to run aground or enter a minefield. If dragging a waypoint causes the path to the next waypoint to pass through land or a minefield, that path will marked in red and the Fast Travel button will be disabled.

When not in Add or Delete Waypoints mode, Tapping anywhere else in the chart view will have the usual behavior of setting your sub's target heading to that point. It will also disable the waypoint system, so your sub will be back under manual control. Tapping either of the Left/Right rudder buttons from the Bridge/Periscope view will have the same effect.

Tap on any waypoint to re-enable the waypoint system.

As your sub reaches each waypoint, that waypoint will be removed from the path and your sub will adjust its heading toward the next waypoint.

When your sub reaches the last waypoint, your crew will stop the engines and the waypoint system will be disabled.

Your assigned patrol area can be massive; up to 22,500 square miles of ocean is a lot of water to cover! Getting from one point to another can require days of travel time, which can get tedious even at 32x speed.

That's why there's the Fast Travel system, where you just plot out the path you want to take using the Waypoints system, then let your crew do the mundane management of actually getting you there.

To use it, go to the Chart View, Tap the Waypoints button, then Tap the Fast Travel button. A dialog will open showing the travel time, arrival time, and fuel required. Then you can either approve or cancel the orders.

If you approve the travel plan, your crew will travel submerged during the day to avoid being spotted.

Fast travelling will consume about 25% more fuel that you would by manually travelling the same route entirely on the surface.


An important element of submarine combat is knowing where the enemy is, or your “perception” of the enemy.

You have a limited set of tools for detecting enemies, each with its own range:

In practice, you will rarely detect ships at the maximum ranges listed above; there are a variety of factors that can modify that distance:

Because of its sensitivity to sound, Sonar has some additional factors that can affect it:

Once an enemy has been spotted, information can gradually be gathered by your crew on that ship’s heading, speed, size, class, and eventually even its exact name. This information is essential for calculating torpedo trajectories.

Radar is too low-resolution to provide any of that information, but Spotters, Periscope, or Sonar will.

When you’re surfaced, multiple crewmen are on deck working at spotting ships, so all ships will be going through the identification process once they’re spotted.

But when you’re submerged, only one crewman at a time can use the periscope, so only one ship at a time (whichever ship you have targeted) will be getting ID'd, making the process take much longer for multiple ships.

Even as your crew is working diligently to spot enemy ships, know that the enemy crews are working just as hard to detect your submarine. Many of the factors that affect your ability to perceive them (weather, time of day) affect their efforts equally.

On Easy Difficulty, each enemy's perception range is shown in the Chart View as a red ring. This shows the maximum range at which that enemy might spot your surfaced sub, your periscope, or your submerged sub (with sonar), depending on which of those items are currently available for spotting.

You'll notice that enemy ships' 360-degree ring indicates that they are looking in all directions, while single-cockpit fighter aircraft can only detect items in an arc in front of them. Some planes (like the Nakajima B5N "Kate") have a rear-facing gunner, so they can spot in all directions.

These are the things that enemy ships can detect that might give away your sub’s position, with their approximate maximum ranges:

In practice, enemy ships will rarely detect you at the maximum ranges listed above; there are a variety of factors that will affect that distance:

Once an enemy has spotted one of the detectable items above, they are unlikely to lose sight of it, so they will “lock on” to it and maintain knowledge of your sub’s location (unless it’s a shell splash; that won’t help them know where you are).

So until you that item is no longer visible, they will know just where to look for you. This means you should take measures to shake them off: If you were surfaced, dive. If your periscope was detected, lower it. If your torpedo was spotted or you were pinged on sonar… Well, just try to not be where you were when the detection occurred. Move, move, move!

Note: Locking on is for visual spotting only, it doesn't apply to sonar pings.

As time progresses in the game, the sun will rise and set. Keep in mind that your sub is much harder to spot at night, making surface attacks a more viable option.

Enemy aircraft don't fly at night; keep this in mind when pursuing side missions, as not having enemy aircraft searching above will make pickup/drop-off missions much easier.

The weather in the South Pacific can be quite unpredictable; squalls and storms can blow in suddenly, then clear up just as quickly. Heavy seas, rain, or thick cloud cover also help to hide your sub from enemy eyes; use this to your advantage!

If you want to lurk without moving for an extended length of time, you can use the "Wait In Place" tool, which you'll' find at the bottom of the expanded date/time overlay:

Tapping that button will open a dialog where you can choose to wait for a number of hours/minutes, or until a specific time. The wait time can be from 1 to 24 hours.

There are also buttons to set the wait time until the next sunrise or sunset.

Your sub’s primary weapon is the limited set of torpedoes it carries. They pack by far the most punch from your arsenal.

Your sub is equipped with a Torpedo Data Computer (TDC) a device that does the complex calculations for plotting an intercept course for a torpedo against a moving target.

If you are looking through your periscope or binoculars when you fire a torpedo, the TDC will calculate a solution to try to hit the ship at the point where you're aiming.

If you're firing from the Chart view, or if your currently targeted ship isn't under your periscope/binocular center, the TDC will automatically aim for the center of the ship.

The maximum fire arc, either from the bow or the stern of your sub, is 90 degrees. That arc is shown on the Chart View as green lines extending at an angle from your sub. If you are using the TDC to target a ship that is currently outside of that arc, or will be outside of that arc by the time the TDC-controlled torpedo reaches it, then you will not be able to fire.

Data for the TDC is automatically entered via the periscope; if the periscope is submerged or offline due to damage, the TDC will not be available. In that case, the button for it will be greyed out.

If you want to manually aim your torpedoes without the TDC's assistance, Tap the TDC button to disable it and the button will turn red. Tap it again to turn it back on.

If the TDC is unavailable for any reason, you can manually set up torpedo shots in the Chart view by lining up the Torpedo Track with the track for the currently targeted ship. Each has a series of time markers showing where they will probably be at specific points in the future; if you can rotate your sub to make the lines intersect at the same time point, you will probably hit the ship.

The maximum range of your base torpedo (the Mark 14) is about 3000 meters, though you can upgrade to torpedoes with longer range.

To prevent torpedoes from destroying your sub, their warheads are not armed until they have traveled 250 yards. If one hits a ship before traveling that distance, it will just "clang" on the hull without detonating or causing any damage.

Engines and boilers tend to be located towards the back of a ship, making it more vulnerable to torpedoes. So torpedo hits to the stern do 25% more damage than a midships hit, while a hit to the bow does 25% less.

Your secondary weapon is an upgradeable deck gun that can only be used when you are surfaced. It can fire 360 degrees to a range of about 2000m, though its accuracy drops off rapidly above 1000m. The deck gun's left/right aim always targets wherever you are looking in Bridge View; the up/down aiming (ballistic arc) is handled by the gun crew.

To fire the deck gun, press the "Deck Gun" button, which also shows the remaining ammo. The green circle will also show a timer when the gun is being reloaded.

After surfacing, it takes the gun crew some time to prep the gun; that time is reduced by the Output of the Deck Gun location.

Finally, your sub has an upgradable Anti-Aircraft gun for defense against enemy airplanes when you are on the surface. To use it, you must switch to the AA Gunner view by Tapping the "AA Gun" button at the bottom left.

Once you're in AA Gunner view, you can aim the gun left, right, up and down using your mouse, touchscreen, or gyroscope, depending on what hardware you have available and what you've selected in the Options menu.

Like the deck gun, it takes a few seconds to load and prep the AA gun for firing after you surface.

The highest upgrade to your AA gun is the Bofors 40mm Autocannon; it fires explosive "flak" shells. With this gun, you no longer have to hit an enemy directly: If a shell passes near an enemy target, it will detonate, causing ranged damage.

To exit AA gunnery mode, Tap the close button at the top right of the screen.

While your deck gun loads and fires individual shells, the AA gun uses ammo magazines, so two ammo counts are displayed for the AA gun:

  1. On the bottom is the total ammo that your sub carries; once it runs out, you can no longer use the AA gun for the remainder of the mission.
  2. In larger text above that is the current magazine's ammo count. Once that reaches zero, it will take a few seconds to automatically reload, during which time you will not be able to fire.

You can manually replace a partially-used magazine for a full one by Tapping the "Reload" button. The gun will also be automatically reloaded any time you leave AA Gunnery mode.

While the primary purpose of the AA gun is for defense against lightly-armored enemy aircraft, it can also be used against ships and shore targets. But keep in mind that it doesn't do nearly as much damage against the thick armor plate of ship hulls as the deck gun or torpedoes, so you can burn through a lot of ammo to get the same results.

When your sub is on the surface, enemy escorts can attack you with their primary gun. That gun type will vary depending on the ship, but in all cases, you will have to make the choice whether to stay on the surface and try to duel it out, or submerge and evade.

If you do elect for a surface battle, you can make yourself more difficult to hit by moving fast and turning frequently, which will throw off the enemy gunners’ aim.

The heaviest surface weapon, artillery guns have a terrifyingly long range and fire large explosive shells that will do significant damage if they hit you. Their disadvantage is their relatively low muzzle rate, giving you time to maneuver out of the way when they attack from a distance.

The specific fire rate, muzzle velocity, and damage caused by enemy shells will vary depending on the level of the enemy ship.

Smaller gunships are equipped with light anti-aircraft guns that you'll find are remarkably effective against your submarine's hull. They don't have the range or do nearly as much damage as the heavy shells fired by artillery guns, but they are devastatingly accurate at close range.

The lightest of the surface-attack weapons, machine guns are only effective at close range, and even then a single bullet hit will only cause fractional damage to your sub.

But they can put out a ferocious rate of fire, and the damage from getting peppered by a few hundred rounds really adds up fast.

Any weapons used to attack you while underwater will have their effectiveness amplified by how deep your sub is: The higher pressure at greater depths means that

Once you've submerged, the most common weapon used against you is the depth charge. These are cannisters filled with explosives that are dropped from a ship or airplane, sink to a preset depth, then detonate. The shockwave from those detonations, if close enough, can rupture your pressure hull and damage your sub.

Your soundmen will update the estimated depth of the charge as it sinks. Once its reaches its target depth, it will detonate. The range of the explosion will also be visible in your Chart View.

The amount of damage a depth charge causes depends on:

  1. The type of depth charge;
  2. how close the explosion is;
  3. how deep your sub is (the increased water pressure at greater depth magnifies the effect of the shockwave).

Japanese cruisers and destroyers carry the Type 93 "Long Lance" torpedo. A truly fearsome weapon, its massive warhead will cause severe damage to your sub if it hits you. Typically launched at submerged targets from a range of 600 to 2000 yards, the torpedo will immediately turn to its gyroscopically-set heading and dive to its preset target depth.

Your soundmen will mark its estimated depth on your chart view. Once the torpedo's heading and depth have settled, it will continue to cruise straight ahead, so evasion is simply a matter of getting out of its way, either laterally or vertically.

At this time the Japanese have not yet developed a reliable magnetically-fused warhead, so the torpedo must directly impact your sub in order to detonate. That may change in the future...

One method used by the Japanese to protect harbors or other enclosed spaces is to lay minefields. These are marked on your charts with red cross-hatching:

Most mined entrances will also be protected by surface defenders in the form of gunships, shore batteries, or some other other means of spotting a surfaced enemy intruder.

So to enter the harbor undetected, you will have to submerge and navigate through the mines. To accomplish this, you have two things on your side:

  1. The Japanese never developed magnetic-proximity fuses for their mines. This means you have to actually come into physical contact with a mine's pressure-fuse spikes before they will detonate.
  2. Your sub is equipped with magnetic field detectors, allowing you to locate (and hopefully avoid) mines within a small radius around you.

Information about each detected mine is displayed in the chart view:

The size of the mine icon indicates how vertically close it is to your sub; that is, a mine 10 feet below your sub will appear much smaller than a mine at the same depth as you.

The rotation of the mine icon indicates whether it is above or below you; an upside-down skull shows that a mine is below you, while a right-side up skull shows a mine above you.


If you come into contact with a mine and detonate it, the amount of damage it causes will depend on how deep you are: The deeper your sub is, the more damage will be caused due to the increased water pressure.

Mine damage can be reduced with the "Pressure Hull" upgrade.


Slow, lumbering... And your primary target. Your main goal in this war is to sink as many of these as possible. Cargo ships, fuel/ore carriers, troop transports: The more transport tonnage you can send to the bottom, the less fighting ability the enemy will have.

Some transports are armed, usually with machine guns. Their merchant marine crewmen are generally not as effective with their guns as naval ship personnel, but they can still cause plenty of damage if you get close.

These special targets are high-value prizes. Battleships, aircraft carriers, cruisers; they're designed to be highly effective against surface targets, but they can't touch you when you're submerged.

Almost every convoy will have at least one escort ship, usually more. From the smallest sub-chaser to the most heavily-armed destroyer, they're all light, fast, maneuverable, and specifically designed for one purpose: Killing you.

On the surface they will use their guns on you. Once you submerge they will use sonar to locate you, then drop depth charges on your head.

Enemy airplane pose a serious threat to submarines: Their "eye in the sky" point of view gives them a dangerously long spotting range for a surfaced sub, or even just a periscope poking out of the water.

During daylight hours, there are usually multiple long-range planes patrolling Japanese-help waters. In addition, at least one plane will always be escorting an aircraft carrier during the day. At dusk, all planes will return to base.

If an enemy plane see you, they will:

A) Radio your position to any nearby escorts, which will come investigate if they're in range, and

B) Attack you with whatever weapons they have at their disposal.

If you spot an enemy plane before they spot you, you should strongly consider diving to avoid detection: In the Silent Service, discretion is the better part of valor!

But if they've already spotted you, if you're unable to dive due to damage, or if you're simply a recklessly aggressive captain, you can take them on with your AA Gun.

TIP: One valuable upgrade that can help you detect enemy planes long before they become a threat is SD Radar.

The Japanese have either seized or built a variety of land bases across the South Pacific. While not your primary mission, it's always helpful to the war effort to destroy these bases whenever given the opportunity.

But be careful, most bases will have defensive shore guns, and some may also have armed ships protecting them.

Ranging from light machine guns through AA guns, all the way up to heavy artillery batteries, shore guns are mainly used to defend bases and harbor/bay entrances (often in combination with minefields).

Your primary mission is always to sink enemy shipping. But because your stealth allows you to advance much further into enemy-held territory than the rest of our naval forces, you may occasionally be called upon for special side missions.

Usually these are the result of newly-gathered intelligence, and will be delivered to you via FOX encrypted radio message from COMSUBPAC at Pearl Harbor. You will be notified of new radio messages via the Comms button at the top of your HUD:

Tap the Comms button to show the radio message, and to zoom to the location of the side mission in your Chart view. The location will be marked with a pin:

Tap the pin any time to view the details of that mission.

Side missions may be anywhere in your patrol area, and could take a lot of time/fuel to reach. There is never a time limit on starting them, so don't feel that you have to immediately race off as soon as you receive a transmission.

Some missions require you to hold your sub on the surface in a specific location for a minute or two while people, supplies, or equipment are transferred on or off your boat. That location will be marked on your map and in the world with a green ring and a green smoke signal.

To view a list of all currently-available side missions, Pause the game and Tap Mission Status, then select the "Comms" tab. You can also get there directly by holding down the Comms button.

Before departing for a mission, your sub will be loaded down with all the supplies it can carry. But once you're out in enemy territory, there is no way to resupply, so it's up to you to use your precious resources wisely.

This is your most valuable resource: Torpedoes are huge, heavy, and very expensive, so you can only carry 24 of them. They do by far the most damage to enemy ships, so make every shot count!

The 186 artillery shells for your deck gun are a great way to take out unarmed ships while surfaced. They're also essential for destroying shore targets.

Your Anti-Aircraft gun's primary purpose is shooting down attacking enemy planes. They will also damage ships and shore targets, but will only do half as much damage to a ship's thick hull (compared to the thin skin of an airplane). Upgrades to your AA gun will allow it to do significantly more damage.

Your fuel bunkers carry a staggering amount of fuel (enough to carry you 8,000 nautical miles!), so you will rarely have to worry about running out of fuel on a mission.

Your batteries power the electric motors used to drive your sub when submerged. Fully charged, they hold enough power to run your motors at maximum throttle for 50 minutes at their base level. Upgrades can be applied that will increase that run-time.

They will be automatically recharged when your sub is surfaced; recharging consumes Fuel at a rate equivalent to running your engines at 50% throttle. Upgrades can be applied to speed up the rate at which your batteries recharge.

When submerged, your oxygen (O2) storage tanks provide air for some of your sub's functions:

When surfaced, your O2 tanks will automatically be refilled. The rate of refilling can be increased with upgrades.

Your sub is crewed by 8 officers and 42 enlisted men. In battle, those men can be injured, knocked unconscious, or even killed. The current overall state of your crew is displayed on the Crew gauge.

See here for more detailed Crew management.

Any hit by an enemy weapon will cause damage to a specific location on your sub. The number of locations affected will scale with the amount of damage.

Any damage to a location comes with a chance that it will also cause flooding. If you are submerged, that chance is doubled.

The water taken on by flooding will add a downward force to your sub, trying to make it sink. A small amount of this force can be overcome with your sub's buoyancy tanks. A slightly larger amount can be compensated for by increasing your sub's speed, as that will increase the effectiveness of the dive planes to "push" your sub upward.

If you are surfaced, your sub won't start sinking until Flooding drops to 75% or lower. If that happens, your target depth will be automatically set to periscope depth to prevent your sub re-surfacing at an inopportune time.

See Damage Control for help with managing and repairing flooding and damage.

While any location-specific damage can be repaired by your capable crew, it does take a long-term toll on the overall condition of your boat, gradually weakening your pressure hull. Every time you take damage, your Hull Integrity decreases slightly, and cannot be repaired without returning to base.

A degraded Hull Integrity reduces your sub's maximum rated depth, as well as the actual depth at which your sub will implode.

Your sub's current Hull Integrity and maximum rated depth are shown as a vertical gauge on the Damage Control screen.

Tap anywhere on the HUD gauges ![](W:\UnityProjects\Crash Dive 2\Project_Main\Assets\Resources\manual\images\HudGauges01.jpg)to open the Sub Management window.

At the top of the Management window you can see an overview map showing that your sub is divided up into compartments, each with its own specialized task. In that map is all the key information for each compartment:

Tap on any compartment to see more detailed info on it, including what the compartment does, who is crewing it, and how its damage and "Output" will affect you.

The "Output" of a compartment is its total effectiveness: The summary of its damage, flooding, and the skill level and health of the crewmen stationed there.

The Output of each compartment will modify its performance. For example your sonar listening range will increase or decrease based on the Sonar compartment's Output. Torpedo load times will be adjusted based on the Output of the torpedo rooms.

A fully-crewed, undamaged compartment will start with an Output of 100%. If crewed by sailors with skill points in that task, its Output will go up (above 100%). If the compartment is damaged, or a crewman stationed there is injured or killed, its Output will go down.

The game will always pause when you open the Management window; once open, you can "start the clock" again with the standard time controls at the top left.

But keep in mind that if you do this, the action outside of the Management view will also resume. Time will pass, enemies may attack, your sub may run aground...

Damage control is automated, but you have the option of taking as much personal control over it as you like.

Any damage taken by your sub will be localized to a specific compartment. That compartment's Output will be reduced by its current level of damage and flooding.

Any compartment that is at least 50% flooded is unusable and its Output will be 0 until the flooding has been repaired.

Your highly-capable repair crews will jump into action automatically whenever they're needed.

They will attack the damage based on the priority list under "Repair Order", from top to bottom. If you want to change their priorities, just drag and drop a compartment up or down in the list.

Because the single biggest threat to a sub is the flooding that will send you to the bottom, crews will always prioritize flood repairs first by default. If you don't want them to do that, uncheck the "Stop Flooding First" button on the right of the management window to turn it off.

For example, if you prefer surface engagements you may want to prioritize Engine repairs over Motors. In that case, you would drag the Engines repair card to the top of the list.

If you decide to return to the default repair order, just Tap the "Default Repair Order" button on the right of the management window.

If you want to tell your repair crews to focus on a particular damaged compartment, but just this one time, you don't have to re-order the list: Just Tap on the circular wrench icon on the right of that compartments repair card, and they will immediately shift their efforts to getting it back online. Once that compartment is fully repaired, they will go back to the regular priority order.

Equipment that is located outside of the sub's pressure hull (e.g. the Deck Gun, Dive Planes, and Rudder) can only be repaired while surfaced.

Like Damage Control, crew management is optional: Your XO will automatically assign crew tasks as needed without your intervention.

But if you want to take full control of your sub, you can assign each crewman to a compartment to maximize the Output from those tasks you consider most important.

When you Tap on any compartment in the overview map, a list of the crewmen assigned to it will be displayed in a vertical list. A card for each crewman will display some basic info:

Tap on any crew card to expand it and show some additional info:

When crewmen come on board your sub, those with more experience (higher rank) will have "skill points" at particular tasks. Those are shown as black diamonds in their info card, and they can have up to 5 skill points for each compartment to which they can be assigned.

The more skill points, the better the crewman is at that particular task; assigning him to a task where he has high skill will increase the Output of that compartment.

For example: If a crewman has a "Sick Bay" skill point, that means they have medical training. If they are assigned to work in the Sick Bay, then Sick Bay's Output will be increased by the crewman's skills, which in turn will cause any injured crewman to heal faster, and any unconscious crewman to awaken sooner.

Gaining Skills: Crewmen continuously gain skill in the task to which they are assigned, gradually adding skill points for every hour they spend in their assigned location. Note that during Fast Travel or Wait in Place, because no enemies are ever engaged crew only gain one hour's worth of skills regardless of the travel/wait time.

The obvious management route is to assign crewmen to the task that they are most highly skilled at; this is how the X.O. does it if you leave "Auto-Assign Crew" checked.

But something to consider: Assigning crewmen to tasks where they don't already have skill points will let them level up in additional areas. This cross-training can prove extremely valuable in the case where a crewman is killed or disabled and you need to replace him; on a submarine, having crewmen with a wide range of skills can mean the difference between success and defeat.

To assign a crewman to a new task, just grab the crew card icon for his current task assignment and drag and drop it onto the desired compartment.

When you drag him, any compartments that he can not be assigned to will be grayed out; for example if it is flooded or already fully crewed.

If a compartment is fully crewed, you will have to remove a crewman from it before another can be added. There is usually free space in the Crew or Officers' Quarters where you can temporarily assign someone to make room.

When a crewman is added to or removed from a compartment, the Output of that compartment will immediately change to reflect the gain or loss.

Whenever a compartment takes damage, there is a chance that the crewmen working there will be injured. The chance of an injury, as well its severity, will be proportional to the amount of damage taken.

An injured crewman's Output is decreased, which in turn decreases the Output of the compartment he's currently assigned to.

Whenever a crewman is injured, there is a chance that he will be knocked unconscious. An unconscious crewman's Output will be zero until he regains consciousness.

When a compartment is completely flooded, the crew will scramble to get out. Most will make it, but there's a chance that some will be killed or injured.

By the end of the war, Gato-class submarines were very different beasts from those that first sailed in 1941; their weapons, and capabilities were vastly upgraded throughout the war years. You have access to those improvements through the Upgrades menu before each Campaign mission or Custom game.

There's a wide variety of upgrades available; each will show a description of its effect if you select it in the Upgrades menu. You can also use the "Filter" selector at the top to only show upgrades in certain categories.

You have a limited amount of money to spend on those upgrades, so choose wisely. For example, if you prefer stealth over direct fights, you might want the Batteries upgrade so you can cruise longer distances underwater. Or if you'd rather engage in surface gun battles, you should upgrade your deck gun's range and damage.

Upgrade spending is allocated to those captains who are the most successful, so your budget is determined by the amount of enemies you destroy. The more tonnage you sink, the better you can make your boat!