Knox, being a city boy (like me), possesses only the most rudimentary skills in the water.

Cyborg used to know how to swim, but he isn't what anyone would call buoyant.

The rest of my pups are fair to decent swimmers, Gibbs probably the best after all his years at sea. Though come to think of it, we never saw Kirk go swimming once (unless you count a rather lame episode of the Star Trek cartoon.) (Which I don't.)