(Str; Armor Penalty)
You can swim and maneuver underwater.
Check: A successful Swim check allows you to swim one-quarter your speed as a move action or half your speed as a full-round action. If the check fails, you make no progress through the water. If the check fails by 5 or more, you go underwater. If you are underwater, you must hold your breath to avoid drowning. The Difficulty for the Swim check depends on the condition of the water:
Each hour you swim, make a Swim check (Difficulty 20). If the check fails, you suffer from fatigue. Unconscious characters go underwater and immediately begin to drown.
Challenges: You can take the following challenges with Swim:
Accelerated Swim: For a +5 Difficulty increase, you increase your swimming speed by one-quarter your normal speed. You can take this challenge up to three times to increase your swimming speed up to your normal speed. You suffer the normal effects of failing your Swim check.
Rescuing: Rescuing another character who cannot swim (for whatever reason) increases the Difficulty of your Swim checks by +5, but allows both of you to remain afloat.
Action: A Swim check is either a move action or a full-round action, as described above.
Special: The Armor Penalty for Swim checks is double normal.