Shell Arctic Drill Ship

In this photo provided by the United States Coast Guard, a Coast Guard helicopter crew from Air Station Kodiak conducts the 13th hoist of 18 crewmen from the mobile drilling unit Kulluk in December 2012. The tug Aiviq suffered problems towing the Kulluk, prompting the Coast Guard to deploy cutters and aircraft to while Royal Dutch Shell dispatched additional tugs.
Petty Officer 1st Class Sara Fra / AP
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