“The most intimidating feature for any swimmer, is real swirly, really deep whirlpools,” says professional kayaker and guide Paul Kuthe. “They have a tendency to hold you under water for a long time.” ...

“Even the biggest tidal races can be caught when they are small,” says sea kayaker Paul Kuthe of the river-like currents, whirlpools, and rapids that tidal shifts can cause in the ocean. “Most can be ...