HONOLULU (AP) - Crews are studying a red diesel sheen south of the Honolulu airport a day after a vessel sank off Oahu. U.S. Coast Guard spokesman Chief Petty Officer Kurt Fredrickson says crews are checking to see if any of the oil is recoverable. The sheen was found about 7 miles south of the airport Friday. Separately, a 1-mile-by-50-foot sheen was observed near the Barbers Point offshore mooring buoy. Fredrickson says both are related to Thursday's sinking of the 95-foot Nalani. Overflight surveys showed no sheen in the water where the ship sank, and coastal teams haven't seen any diesel come ashore. But a diesel smell was reported in White Plains and Nanakuli. The Nalani sank after taking on water 2 1/2 miles off Barbers Point Harbor.