Big oil gets more grilling on US spill

May 13-Protests planned in several US cities over spill

PORT FOURCHON, La. / WASHINGTON - Top oil executives faced a second day of grilling by US lawmakers on Wednesday over a deadly well rupture that unleashed a huge oil slick and the specter of environmental disaster in the Gulf of Mexico.

BP Plc, Transocean Ltd and Halliburton Co are all on the hot seat for their roles in what could be the worst oil spill in US history. A desperate race is on to contain the catastrophe, with BP readying a potential subsea fix and troops and prisoners rushing to limit damage to the coast, where crude has started to reach shorelines.

Investors have driven the value of BP shares down more than $30 billion, far exceeding even the worst estimates of the spill's cost, reflecting uncertainty about how the calamity will play out, with an unprecedented and shifting situation.

BP shares were up about 0.3 percent in early trading on the London stock exchange.

With oil gushing unchecked from the sea floor at an estimated daily rate of least 5,000 barrels (795,000 liters), and the expanding slick oozing across the surface, Wednesday was another rough day for the oil industry and its soiled reputation.

The US House of Representatives hearing and a series of panels in coming weeks could spawn new legislation on offshore drilling, an issue which has been thrust onto the crowded domestic agenda of President Barack Obama.

In hearings before two Senate committees, lawmakers accused executives from BP America Inc, Transocean and Halliburton of trying to shift the blame to each other, and subjected them to tough questions about safety and how the well was sealed.

Senator Ron Wyden, a Democrat, at one point interrupted BP America's president, saying, "The culture of this company has been one accident after another." BP had been trying to repair its image since a 2005 explosion at its Texas City refinery killed 15.

Also on Wednesday, an activist group called Seize BP plans protests at the company's offices and other sites across the United States to demand the government freeze its assets to ensure payment for the cleanup and compensation for those hurt by the spill.

Eleven workers were killed in the April 20 explosion that sank the rig. Fisheries and tourism, two of the Gulf's economic mainstays, and birds, sea turtles and other wildlife, are all threatened by the unfolding fiasco that could next month exceed the Titanic-sized Exxon Valdez disaster in Alaska in 1989.

Swiss-based Transocean Ltd denied allegations late on Tuesday that its crew members were asked to sign waivers relating to damage claims soon after its deep water rig exploded off the US gulf coast. Transocean's Deepwater Horizon rig is under contract with BP Plc.

Efforts to transport crew members from the rig to shore were coordinated by the US Coast Guard according to standard maritime procedures, the company said.