Deepcore from The Abyss
Still sat in the abandoned Cherokee Nuclear Plant, Gaffney, South Carolina since 1989.
IMDB says : For financial reasons, the "Deepcore" set was never dismantled. It stands in the abandoned (and drained) South Carolina nuclear power plant, where the film was shot. 20th Century Fox has posted signs around the set informing potential photographers that Fox still owns the set (and the designs) and that any photographs or video shooting of the set is prohibited by copyright law. Their official copyright information is on the Deepcore rig itself.