Essex was an American whaling ship from Nantucket, Massachusetts, which was launched in 1799. In 1820, while at sea in the southern Pacific Ocean under the command of Captain George Pollard Jr., the ship was attacked and sunk by a sperm whale. Thousands of miles from the coast of South America with little food and water, the 21-man crew was forced to make for land in the ship's surviving whaleboats.

The men suffered severe dehydration, starvation, and exposure on the open ocean, and the survivors eventually resorted to eating the bodies of the crewmen who had died. When that proved insufficient, members of the crew drew lots to determine whom they would sacrifice so that the others could live. Seven crew members were cannibalized before the last of the eight survivors were rescued, more than three months after the sinking of the Essex. First mate Owen Chase and cabin boy Thomas Nickerson later wrote accounts of the ordeal. The tragedy attracted international attention, and inspired Herman Melville to write his famous 1851 novel Moby-Dick.