"Dolphins Rescue Man from Shark Attack, Defying Death"

A man who was attacked by a shark while swimming in the Red Sea believes that a pod of dolphins saved his life by scaring off the predator. The man had lost a significant amount of blood and was waiting to die when the dolphins appeared. While experts suggest that dolphins may not intentionally save humans from shark attacks, there have been several cases where dolphins and whales have exhibited protective behavior towards humans in the water. A new National Geographic show, "Saved from a Shark," explores these encounters and the possible motivations behind them.