Troll A, Offshore gas platform in North Sea, Norway
The Troll A platform rises 472 meters from the seabed, with four concrete legs extending 303 meters below the water surface.
Norwegian Contractors built this concrete platform between 1991 and 1995 for Norske Shell, with total construction costs reaching 4150 million Norwegian kroner.
The platform received the Betongtavlen architectural award for its concrete structure design and engineering accomplishments in offshore construction.
The platform extracts natural gas through 40 wells and transports it via subsea pipelines to the processing facility at Kollsnes near Bergen.
Singer Katie Melua performed in 2006 at the base of one platform leg, setting a record for the deepest underwater concert at 303 meters.
GPS coordinates: 60.66667,3.66667
Latest update: May 28, 2025 18:22
Offshore oil platforms are extraction facilities operating up to 2,450 meters below sea level. From the North Sea to the Sea of Okhotsk, from the Gulf of Mexico to the Brazilian coasts, these structures play a significant role in global energy production. Troll A in Norway rises 472 meters from the seabed, while Berkut in Russia supports 200,000 tonnes of structure weight against Arctic conditions. Each installation adapts to specific constraints based on its location. Hibernia off Newfoundland has withstood iceberg impacts since 1997, whereas Thunder Horse in the Gulf of Mexico produces 250,000 barrels daily at nearly 2000 meters depth. In Brazil, Petrobras' P-51 operates at 1800 meters below water, and the Ekofisk complex in the North Sea comprises 30 interconnected platforms. These examples demonstrate the diversity of technologies used for oil and gas extraction in various marine environments.
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