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You attempt to push yourself through the water. The GM may add a modifier based on the turbulence of the water, like adding a +4 bonus in a calm pool, but a -4 penalty in a stormy sea.
Resolution: Athletics 
– Move 1 square through the water.
– Move 2 squares through the water.
– Move half your speed (rounded down) or 2 squares through the water.
– Move your speed through the water.
– You fail to make progress.
– You sink under the water until you succeed on a Swim action. You begin to drown, see Drowning (page XXX).