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Pathfinder Unchained / Consolidated Skills / Athletics (Str; Armor Check Penalty)

Swim

Source Pathfinder Unchained pg. 57
A successful Athletics check while you’re in the water allows you to swim at either half your speed as a full-round action or one-quarter your speed as a move action. If you fail by 4 or less, you make no progress. If you fail by 5 or more, you go underwater. Attempt one Athletics check to swim each round.

WaterAthletics DC
Calm water10
Rough water15
Stormy water20*
* You can’t take 10 on an Athletics check to swim in stormy water.

Action: Move action at one-quarter your speed or full-round action at half your speed.

Holding Your Breath: When you’re underwater, you can hold your breath for a number of rounds equal to twice your Constitution score. If you take a standard or full-round action, reduce the duration you can continue to hold your breath by 1 round. After you run out of rounds, you must succeed at a DC 10 Constitution check each round or begin to drown. Each round, the DC to resist drowning increases by 1. See the Drowning rules from the Core Rulebook.

Extended Swimming: Each hour you swim, you must succeed at a DC 20 Swim check or take 1d6 points of nonlethal damage.

Swim Speeds: A creature with a swim speed gains a +8 racial bonus on Athletics checks to swim. See the Swim skill from the Core Rulebook for more information on swim speeds.