On the surface (0m), run MAN diesel engines for high speed (up to 17 knots). Diesels charge electric batteries and ventilate crew air. When submerged, switch automatically to electric motors. Electric motors consume battery and produce minimal sound.
At 12-14m depth, raise the periscope. Match target mast height in the recognition booklet. The stadimeter graticule calculates precise range: Range = (Mast Height * 1000) / Mils. Input bearing and speed to calculate gyro lead angle.
At 60-75 meters depth, a cold water thermocline boundary layer reflects destroyer ASDIC active sonar pings. When destroyers are hunting, dive beneath 65m and engage Silent Running to disappear from enemy sonar sweeps.
Depth charges detonate with concussive shockwaves. Near misses breach high-pressure pipes. Switch on emergency red battle lighting (R) and activate bilge pumps to prevent flooding from pulling you into crush depth (230m).
• 1, 2, 3, 4: Switch Tactical Views (3D / Periscope / Hydrophone / Chart)
• C: Toggle 3D Voxel Interior Cutaway
• R: Toggle Emergency Red Alert Lighting
• X: Alarm Crash Dive (30m rapid descent)
• W / S: Throttle Ahead / Astern
• A / D: Rudder Left / Right
• Space: Launch Torpedo from selected tube
• Left Click + Drag: Orbit camera / Spin hydrophone wheel