The awakening of the fault that caused the NYC earthquake is the beginning of the end.

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In 250 million years, the vast majority of Earth could become inhospitable to mammals as the planet’s landmasses merge together to form the next supercontinent. At least, that’s the dire outlook of a new study published Monday in the journal Nature Geoscience.

Scientists reached this conclusion by modeling the climate with a supercomputer—and while they weren’t completely surprised by the result, they do find the predictions “a bit depressing,” says Hannah Davies, a geologist at the GFZ German Research Center for Geosciences who was not involved in the study, to Nature News’ Jonathan O’Callaghan.

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“There have been extinction events in the past and will be extinction events in the future,” she tells the publication. “I think life will make it through this one. It’s just kind of a grim period.”

A supercontinent is just what it sounds like: a giant landmass that forms when the planet’s continents join together because of shifting tectonic plates. The last supercontinent that existed on Earth was called Pangea, and it split up roughly 200 million years ago.

Earth’s continents are drifting now, and they could merge back together in 250 million years, scientists predict. They’ve named the next supercontinent Pangea Ultima. And according to the new model, it will be a kind of hellscape.

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