"truly this was a descent into Hades."

The River Styx in the Underworld (Hades)
Public DomainThe River Styx in the Underworld (Hades) - Credit: Wikimedia Commons
Hades was one of the names for the underworld (the land of the dead), named after the Greek god of the dead, Hades. The Roman name for the ruler of the underworld was Pluto.