We thought that the great white shark was the king (or in this case, queen) of the ocean. What could possibly stand up to a 9-foot long vicious fish? Turns out, there are quite a few choices. A female great white shark's disappearance befuddled the Australian scientists, who were piloting a tagging-and-tracking program for great whites in the Down Under. When the tracking device washed up on shore and was analyzed in the lab, they had to conclude that the 9-foot great white shark didn't just disappear - it was eaten by another animal of the sea.

Four months ago, Dave Riggs, the head scientist of the project, found the perfect shark for this tag-and-track project. They named it "Shark Alpha" and planted a tracking device. Then they let her go and decided to check back on it later to see what her travels would reveal.

When the tracking device washed up on shore and brought back into the lab, the story of the great white shark's journey wasn't anything Dave Riggs was expecting. The Shark Alpha had dived deep down the side of the continental shelf, going more than 1,500 feet deep. At first, the tracking device tracked the drop in the water temperature. But soon, the tag started heating up, going from almost freezing 46 degrees Fahrenheit to whooping 78 degrees. Riggs concluded that this only meant that the tag was inside the stomach of another animal. The great white shark was eaten... but by what?

Of course, ocean enthusiasts from all over the world are having a field day of trying to figure out what ate this 9-foot female. Many think, or hope, that an orca, a giant squid or even a kraken had to do with the ingestion. However, the scientists think that it is more likely that a "colossal cannibal great white shark", due to extreme hunger or territorial dispute, ate the poor bugger.

Captured in the upcoming Smithsonian documentary, "Hunt for the Super Predator", the story of the disappearance of this 9-foot great white shark just shows how little is known of the deep blue sea. Watch the video below to see a sneak peek of the documentary!