Fact1: young woman goes dipping in ocean, Fact2: medical examiner 's ruling that death was due to shark attack leads police chief Martin Brody to close beaches, Fact3: Hooper and Brody find half-sunken vessel while searching night waters in Hooper 's boat, Fact4: huge great white shark refuses to close beaches, Fact5: Quint Brody and Hooper set out on Quint 's boat to hunt shark
Output: During a beach party at dusk on Amity Island, a young woman, Chrissie Watkins, goes skinny dipping in the ocean. While treading water, she is violently pulled under. The next day, her partial remains are found on shore. The medical examiners ruling that the death was due to a shark attack leads police chief Martin Brody to close the beaches. Mayor Larry Vaughn overrules him, fearing that the towns summer economy will be ruined. The coroner now concurs with the mayors theory that Watkins was killed in a boating accident. Brody reluctantly accepts their conclusion until another fatal shark attack occurs shortly thereafter. A bounty is placed on the shark, prompting an amateur sharkhunting frenzy. Local professional shark hunter Quint offers his services for 10,000. Meanwhile, consulting oceanographer Matt Hooper examines Watkinss remains, and confirms her death was caused by a shark—an unusually large one. When local fishermen catch a tiger shark, the mayor proclaims the beaches safe. Hooper disputes that it is the same predator, confirming this after no human remains are found inside it. Hooper and Brody find a halfsunken vessel while searching the night waters in Hoopers boat. Underwater, Hooper retrieves a sizable great white sharks tooth embedded in the submerged hull. He drops it in fright after encountering a partial corpse. Vaughn discounts Brody and Hoopers claims that a huge great white shark is responsible for the deaths, and refuses to close the beaches, allowing only added safety precautions. On the Fourth of July weekend, tourists pack the beaches. Following a juvenile prank, the real shark enters a nearby estuary, killing a boater and causing Brodys oldest son, Michael, to go into shock. Brody then convinces Vaughn to hire Quint. Quint, Brody, and Hooper set out on Quints boat, the Orca, to hunt the shark. While Brody lays down a chum line, Quint waits for an opportunity to hook the shark. Without warning, it appears behind the boat. Quint, estimating its length at 25 feet 7.6 m, harpoons it with a line attached to a flotation barrel, but the shark pulls the barrel underwater and disappears. At nightfall, the shark returns unexpectedly, ramming the boats hull, and disabling the power. The men work through the night, repairing the engine. In the morning, Brody attempts to call the Coast Guard, but Quint smashes the radio. After a long chase, Quint harpoons another barrel into the shark. The line is tied to the stern cleats, but the shark drags the boat backward, swamping the deck and flooding the engine compartment, before breaking the cleats off. Quint severs the line to prevent the transom from being pulled out. He heads toward shore to draw the shark into shallower waters, but the overtaxed engine fails. With the Orca slowly sinking, the trio attempt a riskier approach. Hooper puts on scuba gear and enters the water in a sharkproof cage, intending to lethally inject the shark with strychnine, using a hypodermic spear. The shark demolishes the cage before Hooper can inject it, but he manages to escape to the seabed. The shark then attacks the boat directly and devours Quint. Trapped on the sinking vessel, Brody stuffs a pressurized scuba tank into the sharks mouth, and, climbing the mast, shoots the tank with a rifle. The resulting explosion obliterates the shark. Hooper surfaces, and he and Brody paddle to Amity Island clinging to boat wreckage.