Use your mouse to control a submarine.
The submarine shoots automatically.
You can drop the bomb by left click, bomb will be moving forward. Following left click will blow up earlier dropped bomb.

Collect batteries – the more batteries you collect, the more weapons and upgrades you can activate.

Press and hold the CTRL or SPACE key to fix aim and strafe. Bubbles energy is reduced for this ability.

Anytime you can press the M key to switch music on/off, or the S key to switch event sounds.

Press ESC to pause game.

Good luck!