After entering the cave, hit the “L” key to bring up your lighter.
Then, start making your way forward through the cave.
It’s fairly linear here, so continue ahead until you see a light.

Head over to the light and crouch to continue forward.
Make your way through the slightly lower passage until you find a path that leads down into some water.
Ahead, you’ll see some mutants wandering around near another light source.

You’ll spot some lifejackets on the ground, but keep going and turn right when you might.
The Rebreather will equip automatically, as you’ll see if you jump into the nearby water.
That means you’ll need to use the limited supply around the map, so use the Rebreather sparingly.

However, be careful about jumping right in, as there is a hostile shark swimming around.
That wraps up our guide on how to get the Rebreather in Sons Of The Forest.