How to Play Submarine Ballast
Hold S or Arrow Down to flood both ballast tanks and increase descent. Hold W or Arrow Up to blow both tanks and increase buoyancy. Use Q to add bow ballast and E to add stern ballast, changing the submarine's trim and pitch. Use A and D or Left and Right Arrow for the weak horizontal propeller. Ballast changes take time to affect vertical speed, so reverse buoyancy before reaching the target depth. Watch the depth-current chart because each water layer pushes the submarine in a different horizontal direction. Pass every depth gate within its allowed depth and pitch tolerance while avoiding rocks and the seabed. Press P to pause, M for sound, F for fullscreen and R to restart the current mission.
About Submarine Ballast
Submarine Ballast is a single-player browser physics game focused on buoyancy and underwater navigation. Flooding the ballast tanks makes the submarine gradually descend, while blowing them restores positive buoyancy and causes it to rise. Bow and stern ballast can also be adjusted separately to control pitch. Different depth layers contain opposing currents, so choosing when to descend or rise also changes how the submarine drifts horizontally.