A fishing ship that sank last week and is leaking diesel fuel has caused the biggest spill in Alaska's Prince William Sound since the 1989 Exxon Valdez disaster, posing a threat to the area's wildlife, state environmental officials said. The Seattle-based Windy Bay was loaded with about 35,000 gallons (133,000 liters) of diesel fuel when it struck a rock and sank on Saturday in the northern part of the sound about 40 miles (65 km) southwest of the port of Valdez. The spill was tiny compared with the 11 million gallons (40 million liters) of crude oil dumped by the Exxon Valdez when it ran aground on a reef outside Valdez in 1989, polluting miles (km) of coastline.