From Pathfinder Lost Omens Hellfire Dispatches, which isn't enabled.

Slippery As An Eel

FEAT 6

Prerequisites Undersea Privateer Dedication; trained in Acrobatics

You mimic the serpentine movements of an eel. While underwater, you gain a +2 circumstance bonus to Acrobatics checks to Escape, Squeeze, and Tumble Through.

Pathfinder Lost Omens Hellfire DispatchesORC