Tartarus

Greek A realm of eternal darkness, the deepest, most terrible part of the underworld, the opposite of the dome of the sky. Tartarus was even deeper below the Earth than Hades, farther below Hades than the Earth was below the sky, a realm of darkness and death. The Olympian gods exiled the Titans to Tartarus after the great war between the two generations of gods. The Olympians sent other supernatural beings there as well, such as the Cyclopes. Humans were also sent there for punishment, including Tantalus, Sisyphus, and the 50 daughters of Danaus, known as the Danaides. Some poets said that evil men who had nothing to do with the gods and their stories were also punished in Tartarus. In later stories, the realm was more closely associated with Hades.