A PC is in water during combat and requires a swim check to move.
Say, a PC chooses to use the move action first, performs their swim check and fail, sinking 5 feet, are they then allow to use their standard action to move again as they would on land (a double move)?
Would they then be required to perform another swim check to swim back to the surface. If they fail again, will they sink another 5 feet on their turn?
I ask specifically for Pathfinder (as the Beginners Box rules aren't explicit on this), but could this apply to 3.5e?