and exterior filming, meaning they could not be heated above freezing inside to ensure there was always snow on the roof. Outside, the temperature was so low that the camera lenses would freeze and break. The crew had to leave the cameras in the freezing temperatures, as keeping them inside in the warmth resulted in foggy lenses that took hours to clear. Filming, greatly dependent on the weather, took three weeks to complete, with heavy snow making it impossible to film on some days. Rigging the explosives necessary to destroy the set in the film's finale required 8 hours. Keith David broke his hand in a car accident the day before he was to begin shooting. David attended filming the next day, but when Carpenter and Franco saw his swollen hand, they sent him to the hospital where it was punctured with two pins. He returned wearing a surgical glove beneath a black glove that was painted to resemble his complexion. His left hand is not seen for the first half of the film. Carpenter filmed the Norwegian camp scenes after the end scenes, using the damaged American base as a stand-in for the charred Norwegian camp. The explosive destruction of the base required the camera assistants to stand inside the set with the explosives, which were activated remotely. The assistants then had to run to a safe distance while seven cameras captured the base's destruction. Filmed when the heavy use of special effects was rare, the actors had to adapt to having Carpenter describe to them what their characters were looking at, as the effects would not be added until post-production. There were some puppets used to create the impression of what was happening in the scene, but in other cases, the cast would be looking at a wall or an object marked with an X. Art director John J. Lloyd oversaw the design and construction of all the sets, as there were no existing locations used in the film. Cundey suggested that the sets should have ceilings and pipes seen on camera to make the spaces seem more claustrophobic. Post-production Several scenes in the script were omitted from the film, sometimes because there was too much dialogue that slowed the pace and undermined the suspense. Carpenter blamed some of the issues on his directorial method, noting that several scenes appeared to be repeating events or information. Another scene