Suffocation, in-game internally known as “suffocation” or “Damage Suffocation”, is a mechanic in the Ocean Trench and the Cnidarian Reef in which you must refill your Oxygen bar (light blue under your character) or your screen will start blinking red, where shorly thereafter you will start losing about 100 hp/sec. If you don’t find air, Suffocation can and will kill you.
