The Earth around the Mariana Trench, which contains the deepest point on the planet, could be slurping up at least 4.3 times more water than previously estimated, according to new research.

Scientists collected data using seismographs sunk to the ocean bottom in order to better understand water’s behaviour at subduction zones.

These are places where one tectonic plate sinks beneath another—common sites of volcanic activity, but also how water moves into the deeper parts of Earth.

This work might force scientists to rethink how water cycles through the planet more generally.

“Water is key to understanding how our planet has evolved through geological time,” study author Chen Cai from Washington University in St. Louis told Gizmodo.

The Mariana Trench is home to the deepest trough on Earth, the location where the Pacific tectonic plate is subducting beneath the Mariana plate.

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