Adam ‘Ocean’ Walker is attempting to swim seven oceans in the world in aid of the Whale and Dolphin Conservation charity. In this footage, Adam is joined by dolphins as he swims in the Cook Strait, off the coast of New Zealand. Walker is set to be the first British person to complete the Oceans Seven and only four people in the world have completed it so far.

With the English Channel, Gibraltar Straits, Catalina Channel, Molokai Strait, Tsugaru Strait and now the Cook Strait under his belt, Adam’s final swim of the seven takes place this August in the Irish Sea. Credit: YouTube/Adam Walker