Scientist's in Australia tagged this 9-foot great white shark, named Alpha, and less than a year later, a beach-goer found the tag washed up on shore. The data baffled them. It showed the shark had descended to1500 feet below sea level into freezing cold water, but the tag heated up to around 78 degrees farenheit, leading them to believe, something bigger had eaten her. What's big enough to eat a 9-foot great white?