A British long distance swimmer found himself in some hot water while doing a marathon swim in New Zealand water.
Adam Walker spotted a six-foot shark swimming beneath him. He was getting understandably worried when a pod of 10 dolphins showed up beside him. The shark then took off! Dolphins are known to sometimes come to the aid of swimming humans, and have a history of attacking sharks.
Check out the footage on Adam's YouTube page:
Adam is swimming the hardest seven oceans in the world to support the Whale and Dolphin Conservation Charity. You can help him out here.