You swim like a fish. You can stay underwater far longer than others of your race, and you are at home in the water.
Prerequisite: Swim 4 ranks, Endurance.
Benefit: You can hold your breath for 3 rounds per point of Constitution. You gain a +4 bonus on Constitution checks made to continue holding your breath. On a successful Swim check, you swim your land speed (as a full-round action) or half your land speed (as a move action).
Your natural swim speed increases by 10 feet, if you have a swim speed.
Normal: You can hold your breath for a number of rounds equal to twice your Constitution before you are at risk of drowning. On a successful Swim check, you swim half your land speed as a full-round action, or one-quarter your land speed as a move action.