Melting, Not Meteorite, Caused Crater in Antarctica : DNews — news.discovery.com

A mysterious crater that was discovered in East Antarctica last month likely formed beneath a leaky meltwater lake, rather than because of a meteorite impact, researchers now think. The ring of sunken ice, nearly 2 miles (3 kilometers) wide, was spotted a few days before Christmas on the Roi Baudoin Ice Shelf in East Antarctica, north of Belgium's Princess Elisabeth research station. At first, German researchers suspected a meteorite blasted out the crater, because a space rock exploded over East Antarctica in 2004.

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