An official warned the spill posed a "severe threat" to sea life and water quality as China's latest environmental crisis spread off the shores of Dalian, once named China's most livable city. One cleanup worker has drowned, his body coated in crude.

"I've been to a few bays today and discovered they were almost entirely covered with dark oil," said Zhong Yu with environmental group Greenpeace China, who spent the day on a boat inspecting the spill.

"The oil is half-solid and half liquid and is as sticky as asphalt," she told The Associated Press by telephone.

The oil had spread over 165 square miles (430 square kilometers) of water five days since a pipeline at the busy northeastern port exploded, hurting oil shipments from part of China's strategic oil reserves to the rest of the country. Shipments remained reduced Wednesday. [ YAHOO NEWS ]