Depth

Managing the submarine's depth is important for avoiding certain attacks, sonar & more.

Depth
There are two dials that show depth in the submarine. One is located in the Engine Room & one is located in he Control Room. These dials are color-coded from 0-250 meters. When the indicator is within a certain color's borders, that means the submarine is at that depth.

Depth under keel
Depth under keel is a dial in the Control Room that indicates how deep the terrain under the submarine's keel is. This is an important dial to watch when trying to reach the sea-bed to perform the Dead Still Maneuver to make sure the submarine doesn't violently crash into the terrain; at the same time making sure it is close enough for the maneuver to work.

Sea level (0 meters under)
At sea level, the submarine is (more) visible to enemy platforms, ships & airplanes. The submarine can go much faster while not being submerged, but this comes at the risk of being found and attacked by fighter planes, bomber planes, merchant vessels or forts. Destroyers & Battleships can locate and attack the submarine regardless of whether it is

Top speed: 18 knots [confirm?]

Blue Depth (1-25 meters under)
Blue depth, also known as "Snorkel Depth" or "Periscope Depth" is anywhere between 1-25 meters under water. At this depth, the periscope can see above sea level & the engine room can be fed with oxygen necessary to run the diesel engines & refill the compressed air.

Note: This depth and any depth beyond will have a top speed of 6 knots [confirm?]

Green Depth (25-100 meters under)
Green depth is a depth between 25 and a 100 meters under water. This depth can be useful for the Sonar-Break maneuver. The submarine will not take hull damage from being at this depth.

Yellow Depth (100-200 meters under)
Yellow depth is a depth between 100 and 200 meters under water. The submarine will start taking hull damage slowly at this depth.

Red Depth (200+ meters under)
Red depth, also known as "The red zone" is any depth beyond 200 meters under water. This depth is best avoided as the submarine will start taking damage rapidly at this depth.

The seabed
The seabed can be anywhere between 75-250 meters [confirm]. The submarine can lie still on the sea bed to avoid detection by sonar, but this is often reserved as a last resort tactic because of how much it restricts the mobility of the submarine and because the sea-bed is often at low depths, making it hard to resurface quickly for the submarine.