Commands

Arrows or W A S D: steer the sub; in menus, move the highlight.
Mouse or touch: hold the button or a finger where you want the sub to go. Right-click fires the cannon. Tap the on-screen Grab, Fire, Sonar, Light and pause buttons; tap menu rows twice to open them.
Space, Enter or E (hold): OK: grab the nearest find, or drill ore next to you.
1, F or Ctrl: fire the pulse cannon (it aims at the nearest threat). 2 or Q: sonar ping (maps the cave and reveals finds). 3 or L: lights on or off.
Esc, Backspace or P: back, pause (resume or emergency ascent).
Choices menu: pause, how to play, new game, sound, difficulty, save slot, graphics quality and theme.