This guide will show you where to get The Rebreather in Sons Of The Forest. You just have to follow the simple steps below to get it.
First, you will need to make your way to the cave near the beach. Once you get there, just your axe to break it open. There will be some strong enemies for the lower levels.
Head inside and follow the cave all the way to the back to find some supplies and the rebreather.
After getting it, jump right into the water, and it will exit like out by the beach where your Camp was.