The Troll A platform is a Condeep gravity-based structure offshore natural gas platform in the Troll gas field off the west coast of Norway. Built from reinforced concrete, as of 2014, it was the tallest structure that has ever been moved to another position, relative to the surface of the Earth, and is among the largest and most complex engineering projects in history. The platform was a televised sensation when it was towed into the North Sea in 1996, where it is now operated by Equinor. It is often incorrectly referenced as the heaviest object ever moved as well, but it is actually the second heaviest after another Condeep Oil platform the Gullfaks C, which had a displacement approaching 1.5 million tons in comparison with Troll A's 1.2 million.Troll A was towed from the afternoon 10 May 1995 until the platform was in place 17 May 1995. It was lowered to the seabed in 303 meters of water, and had penetrated 36 meters into the soil 19 May 1995. It was self-supporting with no further mooring required.