I highly suggest adding in either a tutorial or a how to play in this game, I tried it and honestly could not make heads or tails on what I needed to do, or how to do it apart from randomly pressing buttons hoping something works.
There's an in-game manual that explains how to use the submarine. You need to click on the question mark icon on the dashboard (which admittedly isn't very intuitive). I've added a note to the game description to clarify this.
