Rapid melting is eroding vulnerable cracks in Thwaites Glacier’s underbelly

Antarctica’s most vulnerable climate hot spot is a remote and hostile place — a narrow sliver of seawater, beneath a slab of floating ice more than half a kilometer thick. Scientists have finally explored it, and uncovered something surprising.

“The melt rate is much weaker than we would have thought, given how warm the ocean is,” says Peter Davis, an oceanographer at the British Antarctic Survey in Cambridge who was part of the team that drilled a narrow hole into this nook and lowered instruments into it. The finding might seem like good news — but it isn’t, he says. “Despite those low melt rates, we’re still seeing rapid

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