Shell's Arctic drill rig was finally towed into a safe harbour in Alaska yesterday after more than 12 boats and 730 people worked to free it from the rocks where it had run aground last week.

Salvage specialists will now conduct a detailed inspection of its hull, fuel tanks and equipment. Shell may also send dive teams and remotely operated vehicles underwater to search for damage to the Kulluk’s hull. It will remain anchored in Kiliuda Bay at least until the Coast Guard deems it safe to travel again, possibly after extensive repairs.