Before revision: The Troll A platform stands on the sea floor below the surface of the sea and each of the continuous-slip-formed concrete cylindrical legs has an elevator that takes over nine minutes to travel from the platform above the waves to the sea floor.
After revision: The Troll A platform stands on the sea floor below the surface of the sea and one of the continuous-slip-formed concrete cylindrical legs has an elevator that takes over nine minutes to travel from the platform above the waves to the sea floor.