The Abyss subjected its cast and crew to an unusually punishing production, with approximately 40 percent of the live-action photography taking place underwater. The crew worked six-day, 70-hour weeks for more than six months, often isolated inside the South Carolina tank complex. Cameron installed decompression equipment, diving bells, and safety divers, but the procedure remained exhausting: he and the underwater unit sometimes spent five hours submerged, then had to breathe pure oxygen while suspended during decompression. Mary Elizabeth Mastrantonio later recalled that the crew never seemed to begin and finish a scene in the same day, and she suffered a physical and emotional breakdown. During the repeated resuscitation takes, she was soaked, topless, slapped, and pounded on the chest; when the camera ran out of film and Cameron wanted another attempt, she reportedly left the set shouting, “We are not animals!” Ed Harris also broke down in tears while driving home, while Michael Biehn described being trapped underwater after the lights suddenly went out. Frustration became so intense that crew members reportedly threw couches through windows and smashed walls in their dressing rooms. Cameron defended the process by arguing that the actors’ waiting time paled beside the hours he and the diving crew spent at the bottom of the tank, but both Harris and Mastrantonio later made clear that the shoot was not enjoyable. Mastrantonio summarized the experience bluntly: “The Abyss was a lot of things. Fun to make is not one of them.”
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