The landmass of Australia could be harboring a massive, subterranean secret.

In a new essay for The Conversation, geologist Andrew Glikson explains his latest research that indicates that an epic asteroid crater could be buried underneath the continent — and all the evidence points to it being the largest known on the planet, by a huge margin.

Known as the Deniliquin structure, Glikson estimates in his study, published in the journal Tectonophysics, that it’s over 320 miles in diameter.

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That would dwarf the largest confirmed impact structure, the approximately 100-mile-wide Vredefort Crater in South Africa, not to mention the similarly sized Chicxulub crater, believed to be from the asteroid that wiped out the dinosaurs.

“The history of Earth’s bombardment by asteroids is largely concealed,” Gilkson wrote.

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