Designated a semi-submersible drilling unit
Built in 2001 by South Korea's Hyundai Heavy Industries Shipyard
Size: 396ft (120m) long by 256ft (78m) wide
Designed to operate in water depths of up to 8,000ft
An oil rig in the Gulf of Mexico that caught fire after an explosion on Tuesday night has now sunk, the US Coast Guard has said.
A search is continuing for 11 missing workers after the blast at the Deepwater Horizon rig.
The other workers on the rig, off Louisiana, were evacuated to the US.
Concerns are rising over a potential for a major spill, with the coast guard saying the rig may be leaking 8,000 barrels of oil per day.
The rig was carrying out exploratory drilling 84km (52 miles) south-east of the Louisiana port of Venice.
The rig had been burning for 36 hours when it sank despite efforts to control the flames.
On Wednesday it had been reportedly tilting about 70 degrees and threatening to topple over.
There has been no sign of the 11 missing workers, despite rescue efforts by patrol boats through the night and an aerial search that resumed on Thursday.
Adrian Rose from Transocean, who own the rig, said those unaccounted for may have been close to the blast and unable to escape.
Carolyn Kemp, whose 27-year old grandson is missing, said that families had been told that it was unlikely any more had survived.
"They're assuming all those men who were on the platform are dead," Ms Kemp told Associated Press. "That's the last we've heard."
Critically injured
The coastguard resumed an air search at dawn, with rescue teams hoping the workers had reached lifeboats.
Rescue crews had covered the expanse of the rig 12 times by air and five times by boat before it sunk.
Seventeen of the 126 workers were evacuated by air and sea for treatment on Wednesday.
Those injured had suffered burns, smoke inhalation and broken bones. Four were critically injured.
Another 100 were later taken by boat to Port Fourchon where they were checked by doctors.
They were then taken to a hotel in New Orleans to be be reunited with their families.
Meanwhile, there are worries that the now submerged rig is leaking large volumes of oil into the Gulf.
Coastguard Petty Officer Katherine McNamara told Associated Press the submerged well could potentially be releasing 8,000 barrels (300,000 gallons) of crude oil per day.
Rear Adm Mary Landry said crews saw an area measuring one mile by five miles (1.5km by 8km) of what appeared to be oil on the surface of the water.
The environmental damage would be worst if a spill were to reach the Louisiana shore, 50 miles away.
Deepwater Horizon was drilling for BP on part of the Mississippi Canyon Block 252 known as the Macondo prospect, in 1,500m (5,000ft) of water.
Built in 2001 by South Korea's Hyundai, the semi-submersible rig is 120m (396ft) long and 78m (256ft) wide, according to Transocean, its operators.
Transocean said there had been no signs of trouble before the explosion and crews had been doing routine work.
The dangers of working on an oil rig have declined in recent decades, but the job remains risky.
Since 2001, there have been 858 fires and explosions in the Gulf, according to the federal Minerals Management Service.
BBC
Built in 2001 by South Korea's Hyundai Heavy Industries Shipyard
Size: 396ft (120m) long by 256ft (78m) wide
Designed to operate in water depths of up to 8,000ft
An oil rig in the Gulf of Mexico that caught fire after an explosion on Tuesday night has now sunk, the US Coast Guard has said.
A search is continuing for 11 missing workers after the blast at the Deepwater Horizon rig.
The other workers on the rig, off Louisiana, were evacuated to the US.
Concerns are rising over a potential for a major spill, with the coast guard saying the rig may be leaking 8,000 barrels of oil per day.
The rig was carrying out exploratory drilling 84km (52 miles) south-east of the Louisiana port of Venice.
The rig had been burning for 36 hours when it sank despite efforts to control the flames.
On Wednesday it had been reportedly tilting about 70 degrees and threatening to topple over.
There has been no sign of the 11 missing workers, despite rescue efforts by patrol boats through the night and an aerial search that resumed on Thursday.
Adrian Rose from Transocean, who own the rig, said those unaccounted for may have been close to the blast and unable to escape.
Carolyn Kemp, whose 27-year old grandson is missing, said that families had been told that it was unlikely any more had survived.
"They're assuming all those men who were on the platform are dead," Ms Kemp told Associated Press. "That's the last we've heard."
Critically injured
The coastguard resumed an air search at dawn, with rescue teams hoping the workers had reached lifeboats.
Rescue crews had covered the expanse of the rig 12 times by air and five times by boat before it sunk.
Seventeen of the 126 workers were evacuated by air and sea for treatment on Wednesday.
Those injured had suffered burns, smoke inhalation and broken bones. Four were critically injured.
Another 100 were later taken by boat to Port Fourchon where they were checked by doctors.
They were then taken to a hotel in New Orleans to be be reunited with their families.
Meanwhile, there are worries that the now submerged rig is leaking large volumes of oil into the Gulf.
Coastguard Petty Officer Katherine McNamara told Associated Press the submerged well could potentially be releasing 8,000 barrels (300,000 gallons) of crude oil per day.
Rear Adm Mary Landry said crews saw an area measuring one mile by five miles (1.5km by 8km) of what appeared to be oil on the surface of the water.
The environmental damage would be worst if a spill were to reach the Louisiana shore, 50 miles away.
Deepwater Horizon was drilling for BP on part of the Mississippi Canyon Block 252 known as the Macondo prospect, in 1,500m (5,000ft) of water.
Built in 2001 by South Korea's Hyundai, the semi-submersible rig is 120m (396ft) long and 78m (256ft) wide, according to Transocean, its operators.
Transocean said there had been no signs of trouble before the explosion and crews had been doing routine work.
The dangers of working on an oil rig have declined in recent decades, but the job remains risky.
Since 2001, there have been 858 fires and explosions in the Gulf, according to the federal Minerals Management Service.
BBC
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