A Great White Shark Was Eaten by a Super Predator of the Deep

In Australian ocean,  a female great white shark, whose code name was Shark α, was tagged for gathering data. However, it provided the studying team of an unexpected result that blew away their mind. Four months later, the tag was found washed ashore 2.5 miles from where it's attached to the shark. From the tag-data, the researchers found a mysterious evidence that the shark was appeared to be dragged down into the deep trench then eaten. The tag was remained in the stomach of the unknown predator for a few days and released. So here is a question: what kind of predator could attack and eat a great white shark that is believed to be the dominant of the sea? 

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Via: io9