The Troll A natural gas platform located off the west coast of Norway with a pulling force of 1.2 million tons, a height of 472 m and a specific gravity of 650,000 tons, is one of the largest and most complex engineering projects in human history.
It is one of the most massive structures in human history, and the largest object ever moved by humans across the surface of the Earth.
Typically, the legs are transported separately on a floating platform, and then reassembled upon arrival.
But with Troll A, the entire rig was assembled in the village of Vats in the Rogaland region of Norway. It was then towed over 200km to an area of the sea about 80km northwest of Bergen in 1996. The towing process took seven days.
The distance from the surface of the rig to the sea surface is 303m. The elevator is installed inside a giant cylinder. It is estimated that it takes more than 9 minutes to move from the top of the rig to the bottom. The elevator is protected by a reinforced concrete wall more than 1m thick.
Troll A was recognized by the Guinness Book of World Records as the world's largest offshore gas rig in 1996. That title currently belongs to the Petronius rig in the Gulf of Mexico, located 610m below the ocean floor.
At the time of construction in September 1991, Troll A was estimated to cost approximately $650 million.
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