Mysterious 'Crater' in Antarctica Has Ominous Cause

A "crater" in Antarctica once thought to be the work of a meteorite impact is actually the result of ice melt, new research finds. The hole, which is in the Roi Baudouin ice shelf in East Antarctica, is a collapsed lake — a cavity formed when a lake of meltwater drained — with a "moulin," a nearly vertical drainage passage through the ice, beneath it, researchers found on a field trip to the area in January 2016. "That was a huge surprise," Stef Lhermitte, an earth science researcher