In the dark, brain coral bubbles give off a small amount of light when they pop, so keep an eye out for what looks like a light that blinks 3 times. Brain coral also tends to spawn in caves, where they’re most useful to you.

They also blow bubbles! Brain coral burp out 3 bubbles at a time that can restore up to 30 oxygen - nothing to sneeze at and definitely more than what bladderfish can do for you. Swim over brain coral for oxygenīrain coral is good for more than just the puny task of building advanced underwater computers to power high-tech diving machines. Just grab one right out of the ocean and chow down on the raw bladderfish to restore a small amount of oxygen! These can be great for early game cave exploration before you’ve gotten the chance to craft better oxygen tanks. However, these adorable swimming Brita filters also have another use.

We already know that bladderfish are essential in the early game for crafting water bottles and keeping yourself hydrated. Warning: this article contains minor gameplay spoilers.

Subnautica game beginner guide