The Mast Walk by Alex Thomson
Solo round the world yachtsman Alex Thomson performs a daring feat on board his high-speed yacht, Hugo Boss. In this video, he climbs up the 30-meter high mast of the moving vessel and dives into the ocean.
This is not the first stunt we've seen from Alex - two years ago he completed the 'Keel Walk', a stunt that has become famous throughout the world.
See both stunts below.