BP's live stream of the oil leak from a remotely operated vehicle on the seabed:
BP engineers began a critical "top kill" maneuver to try to seal the blown-out Gulf of Mexico well Wednesday afternoon by injecting mud into a massive device on top of the breach.
The company confirmed that it had started the high-profile procedure shortly after Coast Guard Rear Adm. Mary Landry consulted with government scientists and gave her approval. The top kill, which involves pumping heavy mud into the gusher to plug it up and then sealing it with cement, has never been tried at a depth of 5,000 feet.
BP CEO Tony Hayward said the effort to plug the spill was going as planned, but it will be at least a day before it is known whether the procedure is successful. Hayward has given it a 60 percent to 70 percent chance of success, but the company has also been careful to warn that there are no guarantees.
Heard On 'Morning Edition':
NPR's Richard Harris Discusses The 'Top Kill' Manuever
An armada of oil-industry ships floated above the well site, 50 miles off the coast of Louisiana. Several of the vessels would be involved in pumping a big slug of mud down a pipe to the seafloor and through 3-inch lines that connect into the Deepwater Horizon rig's broken blowout preventer.
President Obama could get the results in person. He is expected to visit the Gulf on Friday to review efforts to halt the leaking crude, which from what scientists can tell from the underwater video seems to be growing significantly darker. That suggests heavier, more-polluting oil may be spewing from the blown-out well.
At least 7 million gallons of crude have spilled in the weeks since the Deepwater Horizon rig exploded April 20, fouling Gulf Coast marshland and coating birds and other wildlife. London-based BP initially said it might cut a live undersea feed of the gusher before it starts the top kill, but the company later said it would continue the feed during the attempt.
BP said in court documents on Tuesday that roughly half of the 25,000 claims it has received from Louisiana fishermen and shrimpers in compensation for lost revenue have been paid — a total of $29 million.
Meanwhile, a memo sent to the House Subcommittee on Oversight Investigation on Tuesday presented highlights of BP's internal investigation into what caused the disaster — including that rig workers continued drilling despite several warning signs that something might be wrong.
The first indication came at 51 minutes before the blast and a second at 41 minutes, according to the memo that Reps. Henry Waxman and Bart Stupak sent to panel members. The rig team then performed some tests and was "satisfied" with the results, so workers continued to drill.
A third warning sign came 18 minutes prior to the explosion, when drilling was halted, the memo stated.
"Further, BP's preliminary findings indicate that there were other events in the 24 hours before the explosion that require further inquiry," the memo read. "As early as 5:05 p.m., almost 5 hours before the explosion, an unexpected loss of fluid was observed in the riser pipe, suggesting that there were leaks in the annular preventer in the [blowout preventer]."
A boat uses a boom and absorbent material to soak up oil in Cat Bay, near Grand Isle, La., on June 28. A tropical storm is expected to hit the Gulf and impede cleanup efforts.
Joe Raedle/Getty Images
Florida Gov. Charlie Crist and wife Carole Rome Crist (right) stand with others during a Hands Across the Sand event June 26 in Pensacola, Fla. The event was staged across the nation to protest offshore oil drilling.
Joe Raedle/Getty Images
Oil clouds the surface of Barataria Bay near Port Sulpher, La., on June 19.
Sean Gardner/Getty Images
Workers adjust piping while drilling a relief well at the site of the Deepwater Horizon oil spill.
Charlie Neibergall/Getty Images
A dolphin rises up out of the water near Grand Terre Island off the coast of Louisiana on June 14.
Derick E. Hingle/AP
President Obama stands with Mississippi Gov. Haley Barbour (right) and Gulfport, Miss., Mayor George Schloegel after meeting with residents affected by the oil spill.
Crude oil washes ashore in Orange Beach, Ala., on June 12. Oil slicks, 4 to 6 inches thick in some parts, have washed up along the Alabama coast.
A volunteer uses a toothbrush to clean an oil-covered white pelican at the Fort Jackson Oiled Wildlife Rehabilitation Center in Buras, La., June 9.
Saul Loeb/AFP/Getty Images
A shrimp boat skims oil from the surface of the water just off Orange Beach, Ala., as a family enjoys the surf. Oily tar balls have started washing up on Orange Beach and beaches in the western Florida panhandle.
Sand from a dredge is pumped onto East Grand Terre Island, La., to provide a barrier against the Deepwater Horizon oil spill, June 8.
A dead turtle floats on a pool of oil from the Deepwater Horizon spill in Barataria Bay off the coast of Louisiana on June 7.
Workers use absorbent pads to remove oil that has washed ashore from the spill in Grand Isle, La., June 6.
Plaquemines Parish coastal zone director P.J. Hahn lifts an oil-covered pelican out of the water on Queen Bess Island in Plaquemines Parish, La., June 5.
Heavy oil pools along the side of a boom just outside Cat Island in Grand Isle, La., June 6.
Win McNamee/Getty Images
President Obama walks alongside Grand Isle Mayor David Camardelle (from right), U.S. Coast Guard Adm. Thad Allen, who is in charge of the federal response to the spill, and Chris Camardelle after meeting with local business owners in Grand Isle, La., June 4.
Saul Loeb/AFP/Getty Images
A brown pelican sits on the beach at East Grand Terre Island along the Louisiana coast after being drenched in oil from the BP Deepwater Horizon oil spill, June 3.
U.S. Attorney General Eric Holder announces that the Justice Department has launched a criminal investigation into the BP oil spill. With him, from left: Stephanie Finley and Jim Letten, U.S. attorneys for the Western District of Louisiana; Ignacia Moreno, assistant attorney general for the Environment and Natural Resources Division; Tony West, assistant attorney general, Civil Division; and Don Burkhalter, U.S. attorney for the Southern District of Mississippi.
The oil slick off the coast of Louisiana, seen from above.
NASA via Getty Images
A worker leaves the beach in Grand Isle, La., on May 30. BP is turning to yet another mix of undersea robot maneuvers to help keep more crude oil from flowing into the Gulf.
Jae C. Hong/AP
Protesters cover themselves with a water and paint mixture during a demonstration at a BP gas station in New York City on May 28.
Workers clean up oil in Pass a Loutre, La. The latest attempt to plug the leak was unsuccessful.
Jae C. Hong, File/AP
Residents listen to a discussion with parish officials and a BP representative on May 25 in Chalmette, La. Officials now say that it may be impossible to clean the hundreds of miles of coastal wetlands affected by the massive oil spill.
Sean Gardner/Getty Images
An oil-soaked pelican takes flight after Louisiana Fish and Wildlife employees tried to corral it on an island in Barataria Bay on the coast of Louisiana. The island, which is home to hundreds of brown pelican nests as well at terns, gulls and roseate spoonbills, is impacted by oil from the Deepwater Horizon spill.
A sign warns the public to stay away from the beach on Grand Isle, La. Officials closed the oil-covered beaches to the public indefinitely on Saturday.
John Moore/Getty Images
Pelican eggs stained with oil sit in a nest on an island in Barataria Bay on May 22.
A bird flies over oil that has collected on wetlands on Elmer's Island in Grand Isle, La., May 20. The oil came inland despite oil booms that were placed at the wetlands' mouth on the Gulf of Mexico.
Members of the Louisiana National Guard build a land bridge at the mouth of wetlands on Elmer's Island.
The hands of boat captain Preston Morris are covered in oil after collecting surface samples from the marsh of Pass a Loutre, La., on May 19.
Louisiana Gov. Bobby Jindal (center) and Plaquemines Parish President Billy Nungesser (right) tour the oil-impacted marsh of Pass a Loutre, La. "This is the heavy oil that everyone's been fearing that is here now," said Jindal.
BP Chairman and President Lamar McKay (left), with Transocean President and CEO Steven Newman (center) and Applied Science Associates Principal Deborah French McCay, testifies during a Senate Committee on Commerce, Science, and Transportation hearing May 18 on response efforts to the Gulf Coast oil spill.
Manuel Balce Ceneta/AP
This undated frame grab image received from BP and provided by the Senate Environment and Public Works Committee shows details of the oil spill in the Gulf of Mexico. BP has agreed to display a live video feed of the oil gusher on the Select Committee on Energy Independence and Global Warming Committee's website beginning Thursday evening.
Senate Environment and Public Works Committee/AP
President Obama speaks with local fishermen about how they are affected by the oil spill in Venice, La., on May 2.
Saul Loeb/AFP/Getty Images
Danene Birtell with Tri-State Bird Rescue and Research tends to a Northern Gannet in Fort Jackson, La., on April 30. The bird, normally white when full grown, is covered in oil from the oil spill.
Since the explosion, a third oil leak has been discovered in the blown-out well.
In this aerial photo taken April 21 more than 50 miles southeast of Venice, La., the Deepwater Horizon oil rig burns.
Tendrils of oil mar the waters of the Gulf of Mexico in this satellite image taken Monday. An estimated 5,000 barrels of oil a day are seeping into the Gulf, after an explosion last week on a drilling rig about 50 miles off the Louisiana coast.
Courtesy of Digital Globe
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In a statement to investigators obtained by The Associated Press, an employee of rig owner Transocean said he overheard Transocean senior managers complain on the day of the accident that BP was "taking shortcuts." Truitt Crawford, a rig roustabout, said BP was replacing heavy drilling fluid with seawater in the well.
The seawater was being used in preparation for dropping a final blob of cement into the well as a temporary plug for the pipe. Workers had finished pumping the cement into the exploratory well to bolster and seal it against leaks until a later production phase.
Crawford said seawater would provide less weight to contain surging pressure from the ocean depths. A BP spokesman declined to comment on Crawford's comments.
The latest details come amid new hearings on Capitol Hill at which Rep. Doc Hastings (R-WA) cautioned against a move to ban offshore drilling in the wake of the Deepwater disaster. He urged members of the House Natural Resources Committee on Wednesday to recall when gasoline prices hit $4 a gallon last summer.
"The response from the public was clear: Produce more energy in America," Hastings said. "Turning our back on offshore energy production would be too costly in lost jobs, higher gas prices and increased dependence on foreign sources from nations that are hostile to our way of life."
Rep. George Miller (D-CA) compared the assurances offered by BP before the Deepwater disaster to the assurances provided by Exxon Mobil prior to the 1989 Alaska Exxon Valdez spill that such an accident was "highly unlikely."
"Do those words sound familiar? Yes," Miller said. "Highly unlikely that anything would go wrong on this drilling rig. These assurance aren't worth spit."
Also in Washington, acting Interior Department Inspector General Mary Kendall said a report this week that examined allegations of cozy ties between federal regulators and the oil industry began as a routine investigation. The report found that regulators at the Minerals Management Service, the agency that oversees offshore drilling, had accepted gifts and trips from oil and gas companies.
"Unfortunately, given the events of April 20 of this year, this report had become anything but routine, and I feel compelled to release it now," Kendall said.
She said her biggest concern is the ease with which MMS employees move between industry and government. While no specifics were included in the report, "we discovered that the individuals involved in the fraternizing and gift exchange — both government and industry — have often known one another since childhood," Kendall said.