Cairn Energy's Stena Don oil rig is scaled by Greenpeace activists to prevent it from drilling off the coast of Greenland. Greenpeace activists scale a controversial oil rig in the freezing seas off Greenland. The four expert climbers used inflatable speedboats to dodge Danish Navy Commandos before climbing up the inside of the rig and hanging from it in tents suspended from ropes, halting its drilling operation.