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Full marathon swimming challenge British multi-continent

August 9th, 2014 at 10:50 BST Updated

Adam Walker is the first Briton to 7 Ocean Challenge to complete a difficult series of long-distance open water swimming, only five people have ever done.

It consists of the North Channel swim Cook Strait, the Molokai Channel, the English Channel, the Catalina Channel, the Tsugaru Strait and the Strait of Gibraltar.

Adam Walker started the challenge in 2008 and was seen swimming with sharks and jellyfish writing and even with the dolphins.

He told BBC Breakfast began after he swims a film about a man in the English Channel and thought, "I could do it."