pf2e.fyi
From Pathfinder Lost Omens Draconic Codex, which isn't enabled.

Home in the Deep

FEAT 9
Prerequisites Aqueous Dragonblood

You cut through the water, and dwell beneath the surface with ease. Increase your swim Speed by 15 feet; you also gain the amphibious trait.

Pathfinder Lost Omens Draconic CodexORC