MAY 10 UPDATE:
At the site of the ruptured well a mile underwater, a remote-controlled submarine shot chemicals into the maw of the massive leak to dilute the flow, further evidence that BP expects the gusher to keep erupting into the Gulf for weeks or more.
Crews using the deep-sea robot attempted to thin the oil which is rushing up from the seabed at a pace of about 210,000 gallons per day after getting approval from the Environmental Protection Agency, BP PLC officials said.
Two previous tests were done to determine the potential impact on the environment, and the third round of spraying was to last into early Tuesday.
The EPA said the effects of the chemicals were still widely unknown.