The Oceans Seven: Channel Swimming Grand Slam

The Oceans Seven lists seven straits: the North Channel between Ireland and Scotland, the Cook Strait in New Zealand, the Molokai Channel in Hawaii, the English Channel, the Catalina Channel in California, the Tsugaru Strait in Japan, and the Strait of Gibraltar. Each brings distinct hazards: jellyfish and cold in the North Channel, tidal chaos in Cook and Tsugaru, shipping lanes in Gibraltar, tropical swell in Molokai.

Conceived around 2008 by Steven Munatones, the challenge was first completed by Adam Walker of Great Britain in 2014. Fewer than a hundred swimmers have finished all seven..