Some researchers believe it is the remains of a massive asteroid which was more than twice the size of the Chicxulub space rock which wiped out the dinosaurs.
But rival theories point to links with the Nazis in the Second World War, while some people claim it could be a massive UFO base or even a hidden portal to a mysterious underworld called Hollow Earth.
The “Wilkes Land gravity anomaly” was first uncovered in 2006, when NASA satellites spotted wild gravitational changes which indicated the presence of a huge object sitting in the middle of a 300 mile wide impact crater.
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