Johnson finished first in a record time of 29:54, while Cadell finished in a time of 35:32.
Nearly 500 swimmers hit the water for the early 9 am start. The race totaled 1.6 miles from Chun's Reef to Waimea Bay.
Today's event is the third of four events in the Surf and Sea Swim Series, with the final race scheduled for August 8th.
Eric Diiulio leads the overall standings on the men's side with one event to go, while Kate Costello is the overall leader on the women's side.
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