Cavitation

You are the unfortunate submariner, trapped in this steel casket buried well below the ocean's surface. Finding yourself in uncharted waters swarming with violent creatures and nothing to guide you except your handy sonars, your only safe way forward is to follow the sound of the geothermal vents releasing thousands of bubbles from below. Stay low, stay quiet, and stay vigilant.

CONTROLS:
W/S - Control speed
A/D - Control steering
R/F - Control depth

You can use your active sonar to get a rough outline of your surroundings—but be careful! Its loud noise will attract unwanted attention

Your passive sonar will listen for sounds and show which direction they are coming from. Listen for the geothermal vents follow them along; they will be your guidance towards the way out of here.