Troll A The Tallest Structure Ever Moved by Mankind-The Troll A platform has an overall height of 472 metres (1,549 ft) and weighs 683,600 tons (1.2 million tons with ballast). The platform stands on the sea floor 303 metres (994 feet) below the surface of the sea and one of the continuous-slip-formed concrete cylindrical legs (the leg containing the import and export risers) has an elevator that takes over nine minutes to travel from the platform above the waves to the sea floor. [source]
![Troll A The Tallest Structure Ever Moved by Mankind-The Troll A platform has an overall height of 472 metres (1,549 ft) and weighs 683,600 tons (1.2 million tons with ballast). The platform stands on the sea floor 303 metres (994 feet) below the surface of the sea and one of the continuous-slip-formed concrete cylindrical legs (the leg containing the import and export risers) has an elevator that takes over nine minutes to travel from the platform above the waves to the sea floor. [source] Industrial Architecture, Gas Industry, Out To Sea, Tug Boats, North Sea](https://i.pinimg.com/236x/63/6b/00/636b003cea1c96a944ffa2ac1163038d--oil-rig-north-sea.jpg)
