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Moulin Rouge

In July 2008, researchers from WHOI and the University of Washington spread a harmless red dye into the meltwater on top of the Greenland ice sheet. The team was able to examine the flow at the surface and down into a moulin—a massive vertical tunnel through the ice, stretching to the bottom of the glacier. But more importantly, the team was trying to track how long it would take before the dyed water would flow through and beneath the ice in the interior of Greenland and out into coastal waters (40 kilometers away).
(Photo by Chris Linder, Woods Hole Oceanographic Institution)