Hollywood, he quickly realized that a group of scientists was not that commercial and changed it to a group of blue-collar workers. While making Aliens, Cameron saw a National Geographic film about remote operated vehicles operating deep in the North Atlantic Ocean. These images reminded him of his short story. He and producer Gale Anne Hurd decided that The Abyss would be their next film. Cameron wrote a treatment combined with elements of a shooting script, which generated a lot of interest in Hollywood. He then wrote the script, basing the character of Lindsey on Hurd and finished it by the end of 1987. Cameron and Hurd were married before The Abyss, separated during pre-production, and divorced in February 1989, two months after principal photography. Pre-production The cast and crew trained for underwater diving for one week in the Cayman Islands. This was necessary because 40% of all live-action principal photography took place underwater. Furthermore, Cameron's production company had to design and build experimental equipment and develop a state-of-the-art communications system that allowed the director to talk underwater to the actors and dialogue to be recorded directly onto tape for the first time. Cameron had originally planned to shoot on location in the Bahamas where the story was set but quickly realized that he needed to have a completely controlled environment because of the stunts and special visual effects involved. He considered shooting the film in Malta, which had the largest unfiltered tank of water, but it was not adequate for Cameron's needs. Underwater sequences for the film were shot at a unit of the Gaffney Studios, situated south of Cherokee Falls, outside Gaffney, South Carolina, which had been abandoned by Duke Power officials after previously spending $700 million constructing the Cherokee Nuclear Power Plant, along Owensby Street, Gaffney, South Carolina. Two specially constructed tanks were used. The first one, based on the abandoned plant's primary reactor containment vessel, held of water, was 55 feet (18 m) deep and 209 feet (70 m) across. At the time, it was the largest fresh-water filtered tank in the world. Additional scenes were shot in the second tank, an unused turbine pit, which held of water. As the production crew rushed to finish painting the main tank, millions of gallons of water poured in and took five days to fill. The Deepcore rig was anchored to a 90-ton concrete column at the bottom