Warmed by ocean currents, Antarctica’s Thwaites Glacier could collapse in a few years causing a sea levels to rise by several feet, researchers say.

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U.S., U.K. and Swedish researchers deployed underwater robots close to the seafloor of the Thwaites Glacier to retrieve data, said Dr. Alastair Graham, a geological oceanography associate professor at the University of South Florida. Graham led the study released Monday.

“We’ve essentially found Thwaites has a speed limit that’s higher than what we expected it to have,” Graham told USA TODAY. Experts say what they’ve learned about its ability to quickly retreat raises concerns for the future.

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