Diver Yang Yun was part of a competition to hold her breath for as long as possible in a pool of beluga whales in China. The dive was going smoothly until she tried to move her legs and she couldn't. That's when Mila, one of the beluga whales, came to her rescue. Sensing something was wrong, the animal immediately swam to the drowning diver, took Yun's leg in her mouth and lifted her to the surface to breathe, saving her life.