Troll A platform (1995)
Norway installed Troll A, a concrete gravity platform in the North Sea standing about 369 meters tall. It was one of the largest concrete structures ever moved, towed into place in the Troll gas field.
The platform began producing natural gas from the Troll field, one of Norway's largest.
It proved that massive concrete structures could be built onshore, towed across open sea, and sunk into place — the same method Princess Elisabeth Island uses.
Troll A showed the engineering path for building huge concrete structures in the North Sea and placing them on the seabed.
