First you hear a savage cracking sound, next the rolling crash of thunder.
Then as the icebergs rip away from the margin of the ice-sheet they plunge into the grey waters of the Atlantic with a roar that echoes around the mountains.
Nothing prepares you for the sheer scale and drama of events in this forbidding terrain and all the signs are that the changes at work here are gathering pace.
The only way to reach the ice-sheet is by helicopter - a spectacular flight through remote fjords and the jagged blue-white rubble of the ice.
We travelled with Danish scientist Carl Boggild of GEUS, the Geological Survey of Denmark and Greenland.
For the past few years he has been managing a network of 10 automatic monitoring stations and his first results are alarming - the edges of the ice-sheet are melting up to 10 times more rapidly than earlier research had indicated.
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