Filming
Principal photography began on May 2, 1974, on the island of Martha's Vineyard, Massachusetts, selected after consideration was given to eastern Long Island. Brown explained later that the production "needed a vacation area that was lower middle class enough so that an appearance of a shark would destroy the tourist business." Martha's Vineyard was also chosen because the surrounding ocean had a sandy bottom that never dropped below 35 feet (11 m) for 12 miles (19 km) out from shore, which allowed the mechanical sharks to operate while also beyond sight of land. As Spielberg wanted to film the aquatic sequences relatively close-up to resemble what people see while swimming, cinematographer Bill Butler devised new equipment to facilitate marine and underwater shooting, including a rig to keep the camera stable, regardless of tide, and a sealed submersible camera box. Spielberg asked the art department to avoid red in both scenery and wardrobe, so that the blood from the attacks would be the only red element and cause a bigger shock.
Initially the film's producers wanted to train a great white shark but quickly realized this was not possible, so three full-size pneumatically powered prop sharks—which the film crew nicknamed "Bruce" after Spielberg's lawyer, Bruce Ramer—were made for the production: a "sea-sled shark", a full-body prop with its belly missing that was towed with a 300-foot (91 m) line, and two "platform sharks", one that moved from camera-left to right (with its hidden left side exposing an array of pneumatic hoses), and an opposite model with its right flank uncovered. The sharks were designed by art director and production designer Joe Alves during the third quarter of 1973. Between November 1973 and April 1974, the sharks were fabricated at Rolly Harper's Motion Picture & Equipment Rental in Sun Valley, California. Their construction involved a team of as many as 40 effects technicians, supervised by mechanical effects supervisor Bob Mattey, best known for creating the giant squid in 20,000 Leagues Under the Sea. After the sharks were completed, they were trucked to the shooting location. In early July, the platform used to tow the two side-view sharks capsized as it was being lowered to the ocean floor, forcing a team of divers to retrieve it. The model required 14 operators to control all of the moving parts. The two shark models had different sets of plastic teeth, one was hard and the other was soft, the latter made it easier for the stuntman to be inside of the platform of the shark. For Quint's boat, the Orca, Alves and his team constructed two identical 42-foot models for the film. The second boat, dubbed Orca II, had no motor and was designed to sink on command.
Jaws was the first major motion picture to be shot on the ocean, resulting in a troubled shoot, and went far over budget. David Brown said that the budget "was $4 million and the picture wound up costing $9 million"; the effects outlays alone grew to $3 million due to the problems with the mechanical sharks. Disgruntled crew members gave the film the nickname "Flaws". Spielberg attributed many problems to his perfectionism and his inexperience. The former was epitomized by his insistence on shooting at sea with a life-sized shark; "I could have shot the movie in the tank or even in a protected lake somewhere, but it would not have looked the same," he said. As for his lack of experience: "I was naive about the ocean, basically. I was pretty naive about mother nature and the hubris of a filmmaker who thinks he can conquer the elements was foolhardy, but I was too young to know I was being foolhardy when I demanded that we shoot the film in the Atlantic Ocean and not in a North Hollywood tank." Gottlieb said that "there was nothing to do except make the movie", so everyone kept overworking, and while as a writer he did not have to attend the ocean set every day, once the crewmen returned they arrived "ravaged and sunburnt, windblown and covered with salt water".
Shooting at sea led to many delays: unwanted sailboats drifted into frame, cameras got soaked, and the Orca once began to sink with the actors on board. The prop sharks frequently malfunctioned owing to a series of problems including bad weather, pneumatic hoses taking on salt water, frames fracturing due to water resistance, corroding skin, and electrolysis. From the first water test onward, the "non-absorbent" neoprene foam that made up the sharks' skin soaked up liquid, causing the sharks to balloon, and the sea-sled model frequently got entangled among forests of seaweed. Spielberg later calculated that during the 12-hour daily work schedule, on average only four hours were actually spent filming. Gottlieb was nearly decapitated by the boat's propellers, and Dreyfuss was almost imprisoned in the steel cage. The actors were frequently seasick. Shaw also fled to Canada whenever he could due to tax problems, engaged in binge drinking, and developed a grudge against Dreyfuss, who was getting rave reviews for his performance in Duddy Kravitz. Editor Verna Fields rarely had material to work with during principal photography, as according to Spielberg "we would shoot five scenes in a good day, three in an average day, and none in a bad day."
The delays proved beneficial in some regards. The script was refined during production, and the unreliable mechanical sharks forced Spielberg to shoot many scenes so that the shark was only hinted at. For example, for much of the shark hunt, its location is indicated by the floating yellow barrels. The opening had the shark devouring Chrissie, but it was rewritten so that it would be shot with Backlinie being dragged and yanked by cables to simulate an attack. Spielberg also included multiple shots of just the dorsal fin. This forced restraint is widely thought to have added to the film's suspense. As Spielberg put it years later, "The film went from a Japanese Saturday matinee horror flick to more of a Hitchcock, the less-you-see-the-more-you-get thriller." In another interview, he similarly declared, "The shark not working was a godsend. It made me become more like Alfred Hitchcock than like Ray Harryhausen." The acting became crucial for making audiences believe in such a big shark: "The more fake the shark looked in the water, the more my anxiety told me to heighten the naturalism of the performances."
Footage of real sharks was shot by Ron and Valerie Taylor in the waters off Dangerous Reef in South Australia, with a short actor in a miniature shark cage to create the illusion that the sharks were enormous. During the Taylors' shoot, a great white attacked the boat and cage. The footage of the cage attack was so stunning that Spielberg was eager to incorporate it in the film. No one had been in the cage at the time and the script, following the novel, originally had the shark killing Hooper in it. The storyline was consequently altered to have Hooper escape from the cage, which allowed the footage to be used. As production executive Bill Gilmore put it, "The shark down in Australia rewrote the script and saved Dreyfuss's character."
Although principal photography was scheduled to take 55 days, it did not wrap until October 6, 1974, after 159 days. Spielberg, reflecting on the protracted shoot, stated, "I thought my career as a filmmaker was over. I heard rumors ... that I would never work again because no one had ever taken a film 100 days over schedule." Spielberg was offered, several times, to bow out from the film to shut down production. Spielberg himself was not present for the shooting of the final scene in which the shark explodes, as he believed that the crew were planning to throw him in the water when the scene was done. It has since become a tradition for Spielberg to be absent when the final scene of one of his films is being shot. Afterward, underwater scenes were shot at the Metro-Goldwyn-Mayer Studios water tank in Culver City, with stuntmen Dick Warlock and Frank James Sparks as stand-ins for Dreyfuss in the scene where the shark attacks the cage, as well as near Santa Catalina Island, California. Fields, who had completed a rough cut of the first two-thirds of the film, up until the shark hunt, finished the editing and reworked some of the material. According to Zanuck, "She actually came in and reconstructed some scenes that Steven had constructed for comedy and made them terrifying, and some scenes he shot to be terrifying and made them comedy scenes." The boat used for the Orca was brought to Los Angeles so the sound effects team could record sounds for both the ship and the underwater scenes.
Two scenes were altered following test screenings. As the audience's screams had covered up Scheider's "bigger boat" one-liner, Brody's reaction after the shark jumps behind him was extended, and the volume of the line was raised. Spielberg also decided that he was greedy for "one more scream", and reshot the scene in which Hooper discovers Ben Gardner's body, using $3,000 of his own money after Universal refused to pay for the reshoot. The underwater scene was shot in Fields's swimming pool in Encino, California, using a lifecast latex model of Craig Kingsbury's head attached to a fake body, which was placed in the wrecked boat's hull. To simulate the murky waters of Martha's Vineyard, powdered milk was poured into the pool, which was then covered with a tarpaulin.
