Coast guard calls off search for oil rig workers

The U.S. Coast Guard has called off its search for 11 workers who have been missingfrom anoil rig that exploded and sank in the Gulf of Mexico off the Louisiana coast this week.

Rear Adm. Mary Landry described the decision to call off the searcha very difficultone.

Rescuecrews have spent three days searching a large area surrounding the rig, but could not find the missing workers. Coast guard officials searched by air and sea, hoping the workers had made it to a lifeboat after the explosion.

The coast guard said it will resume the search if any ships in the area see anything.

Earlier, rescue crewsfound two lifeboats but no one was inside the boats. More than 100 workers escaped the Tuesday explosion and fire, whilefour were critically injured.

Carolyn Kemp of Monterey, La., said her grandson, Roy Wyatt Kemp, 27, is among the missing. She said he would have been on the drilling platform whenthe explosion occurred.

"They're assuming all those men who were on the platform are dead," Kemp said. "That's the last we've heard."

Adrian Rose, vice-president ofrig owner Transocean Ltd., said Thursday some surviving workers told thecompanytheir missing colleagues may not have been able to flee the rig in time. He said he was unable to confirm whether that was the case.

Meanwhile, no oil appears to be leaking fromthe drilling rig, the coast guard said.

Theexplosionripped through the Deepwater Horizon rigTuesday, sparking a major fire that burned until Thursday, when the rig collapsed and sank.

Oil giant BP, which contracted the rig, said it has mobilized four aircraft that can spread chemicals to break up oil and 32 vessels including a big storage barge that can suck more than 171,000 barrels of oil a day from the surface.

Mike O'Berry, a senior chief petty officer with the coast guard, said efforts are underway to contain oil that spilled into the water after the explosion. He said BP is the "responsible party" and will leadcleanup of oil that spilled during the fire, but he said the coast guard will oversee the effort.

"It's a very collaborative effort," O'Berry said. "It takes everybody to make this happen."

Alarge oil slick has developed on the water's surface, but O'Berry said underwater robots have shownthere are no underwater leaks.

The rig isroughly 80 kilometres off the Louisiana coast. If more oil does leakfrom the rig,it willdo much less damage at sea thanif it hits the shore, said Cynthia Sarthou, executive director of the Gulf Restoration Network.

"If it gets landward, it could be a disaster in the making," Sarthou said.

Since 2001, there have been 69 offshore deaths, 1,349 injuries and 858 fires and explosions in the gulf, according to the Minerals Management Service.O'Berry said accidents are rare, given that 30,000 people work on rigs there every day.

"They're highly trained. They know the dangers," O'Berry said. "The safety precautions they take are extreme. A testament to that is, of the 126 [workers], 115 are home today with their families."