Uliaga Island

On May 6, 1987, the Tae Woong #603, a 210-foot (64 m), 1,500-ton South Korean fishing boat, ran aground on the east side of the island.[6][7] Although the crew of 49 was quickly rescued by the United States Coast Guard, the ship was too far grounded to be salvageable.[7] Officials worried about the effect the 120,000 US gallons (450,000 l) of diesel fuel on the ship, which was leaking from a ruptured fuel tank at a rate of more than 1,300 US gallons (4,900 l) per hour, could have on the wildlife in the area (Uliaga and the entire Islands of Four Mountains group are protected as part of the Alaska Maritime National Wildlife Refuge).[8] By the morning of May 8, the ship had leaked well over 16,000 US gallons (61,000 l) of oil and a slick spread more than 1.9 miles (3.1 km) around the vessel, which had acquired a 15-degree list to starboard.[9] The shipwreck had occurred a few weeks before the horned puffin population had returned to the island for the summer, though the leaking fuel could potentially affect the 500,000 to 1 million migratory birds that resided on Chagulak Island, 40 mi (64 km) to the west, if not cleaned up quickly.[9][10] On May 11, the US Office of Response and Restoration and the ship's South Korean owners declared the vessel a total loss and decided to eliminate the oil slick and the remaining fuel on board by blowing it up with high explosives.[11] They concluded that the other option of transferring the remaining fuel on the ship to another vessel would be impossible due to the hazardous navigational conditions around the island and the time that would be required to implement the plan.[11] The ship was detonated on May 13 and the slick and remaining fuel were successfully eliminated.[12] The wreck was determined to be the result of navigational error.[11]