With the boat immobilized, the trio attempt a riskier approach: Hooper dons scuba gear and enters the water in a shark-proof cage, intending to lethally inject the shark with strychnineusing a hypodermic spear. The shark demolishes the cage, causing Hooper to drop the spear before escaping to the seabed. The shark attacks the boat directly, killing Quint. Brody, trapped on the sinking vessel, shoves a pressurized scuba tank into the shark's mouth, and, climbing the mast, shoots the tank with a rifle. The resulting explosion obliterates the shark. Hooper surfaces, and, clinging to boat wreckage, the two men paddle to Amity Island.