This article was originally published at The Conversation. The publication contributed the article to Space.com's Expert Voices: Op-Ed & Insights. Buried deep in Greenland's ice sheet lies a puzzling ...

As Greenland’s glaciers melt, water usually drains to the bedrock below before flowing out to the ocean. But in 2014, a huge torrent of meltwater from a subglacial lake burst out of the surface of the ...