Here's the info: a young fighter "resting" in the bushes is gaurding his backpack for you.
― PDA message
Fighter's corpse is a stash located in the Great Swamp in Clear Sky.
Overview[]
The stash can be purchased from Nimble and is located west of the Pump station.
Walkthrough[]
You can avoid the radioactive water if you approach the island from the north where the island is closest to shore.
Gallery[]
PDA map of Code-locked safe.
Approach from the north to avoid radioactive water.
Code-locked safe stash.