Description:Chinook helicopters send water spraying into the air as they land on Kodiak Island, off the coast of Alaska. On Saturday, a U.S. Coast Guard team began investigating how a Royal Dutch Shell drill ship ran aground in shallow waters nearby. The Kulluk oil rig has been stuck here since being engulfed in a New Year's Eve storm. Salvage experts visited Wednesday and Thursday to assess the rig.(0:44)