Wet Reward

Wet Reward is a challenge in Hayter's Folly, an area of the Captain Scarlett and Her Pirate's Booty DLC.

Strategy
Upon entering Hot Spring Hideout for the first time, the catwalks just inside the entrance conceal a short tunnel below. The tunnel can be accessed by dropping down into the water and following the watercourse into the rock. Reaching the back of the tunnel requires a character to crouch down at one point.

There are two pirate chests at the tunnel's end, one of which has a brilliant blue glow. Opening this chest completes the challenge.