While the dolphins circled around like bodyguards, the scientists sprang into action, pulling the hypothermic girl on board and wrapping her in a blanket to warm her. They couldn't even communicate with her, because she was German and no one spoke the language, but it became clear later that the incident was an attempted suicide.
Happily, the girl was rushed to the hospital and revived, and eventually thanked her rescuers -- if the dolphins hadn't led them to her, she would have died.
The scientists couldn't find an explanation for this incredible behavior, but stories like this aren't unheard of. In one stunning anecdote, a pod of dolphins intervened to protect a wildlife filmmaker from becoming a huge hammerhead's next meal: