Underwater cameras were trained on the five-story blowout preventer under the water as a ship on the surface began pumping heavy mud 5,000 feet down, trying to jam the rupture.
As the operation began, cameras caught what looked like a white cloud enveloping the blowout preventer. An engineer watching it worried that the drill mud may be streaming out the top of the preventer.
By mid-afternoon, Cathy Norman had nearly finished her tour of the land her trust oversees. We were boating down Port Fourchon's main shipping channel, almost two miles from the coast where we had seen oil in the morning, when we see something that shocks her.
Oil on the inland marshes.
By late afternoon, the cloud of mud was still visible in the underwater cameras. Louisiana Gov. Bobby Jindal held a news conference to say that oil has been found on more than 100 miles of Louisiana Coast.
"We cannot let bureaucracy and red tape delay our action while oil hits our wetlands week after week," Jindal said.
By evening the images from below looked much the same. BP held a news conference to say the results of "Top Kill" would not be known for 24 hours.
As the moon rose over the Gulf of Mexico, it was not clear what tomorrow would bring.