Last month we talked with ice climber Will Gadd about his descent into a glacial moulin in Greenland to help researchers study how climate change is affecting the Greenland ice sheet. Gadd and glaciologist Jason Gulley found a big moulin to climb down into, with the hope of seeing how meltwater behaves beneath the ice. Gadd explained how fascinating the whole trip was, from learning how to dive in freezing water—the pair wanted to swim any meltwater they found—to the terrifying conditions they found below the surface of the sheet. ABC News made the trip with Gadd and produced the above video, for an even deeper look at what Gadd and Gulley were up to.

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