Crews began lowering a dome to cap an oil leak in the Gulf of Mexico in a bid to avert a major environmental disaster as patches of oil began washing up on land.
US Coast Guard Petty Officer Michael De Nyse said the dome designed to contain oil leaking from a ruptured undersea well went into the water after 10pm on Thursday.
“It’s on its way down,” he said “It takes roughly 10 hours to get to the bottom.”
The unprecedented operation to place the 90 metric tonne dome over a gushing pipe on the seabed is seen as the best hope of staving off the biggest US environmental disaster since the 1989 Exxon Valdez spill in Alaska.
The containment chamber or dome is designed to cap the oil discharge from the Deeowater Horizon oil rig operated by British energy giant BP.
BP officials said they hoped to have the dome “operational” by Monday, when a large part of the oil would be funneled up safely to be stored and processed.
Residents from Texas to Florida were anxiously awaiting the outcome of the perilous operation as failure would mean the crude would continue to gush for three months until a relief well is drilled, putting the livelihoods of coastal communities at risk.
Flights over the area showed the sheen that marks the advancing edge of the massive slick hovering off the Louisiana coast, as well as heavier oil on both sides of the Chandeleur Islands, about 100km east of New Orleans.
Cleanup crews were dispatched to the string of islands, part of the Breton National Wildlife Refuge created in 1904 by former US president Theodore Roosevelt.
Jaqui Michel, an oil-spill cleanup expert with the National Oceanic and Atmospheric Administration, said booms were being placed to protect plants from floating oil.
The slick arrived a little more than two weeks after the Deepwater Horizon rig explosion, which left 11 workers missing and presumed dead and sent oil gushing into the gulf at a rate of at least 760,000 liters a day.
Some 10,000 officials and volunteers have fanned out across shorelines and in more than 250 vessels, such as oil skimmers, to help contain the spill and protect the coast, the US Coast Guard and BP said in a statement.
“I think we have a lot at stake here,” Coast Guard Rear Admiral Mary Landry told reporters, adding that while BP was working round the clock to stem the leak, she remained skeptical that the spill impact would be minimal.
“We are still in a posture of worst-case-scenario planning,” Landry said.
Fears are growing that sea life is already being affected in a region that contains vital spawning grounds for fish, shrimp and crabs, and is a major migratory stop for rare birds.
Louisiana on Thursday ordered an “emergency” halt to shrimp harvesting in waters near the mouth of the Mississippi River where the oil was expected to enter in the coming days, while the state extended a ban on commercial and recreational fishing that had been put in place on April 30.
Even though oil has not yet reached land in large quantities, experts warned that an environmental disaster was already developing deep beneath the Gulf of Mexico and in its swirling currents.
“That surface zone is where the oil is at its most toxic and when the animals are at their most sensitive,” said Doug Rader, chief ocean scientist at the Environmental Defense Fund. “If you’re looking at the underside of the spill you can imagine a rain of hydrocarbons and toxic materials coming down piecemeal into waters below and onto the bottom.”
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