Term: Underworld, Description: The mythic Relm of the Dead, located far underground (aka, Hades; Underworld), Question: Does Hades have a loose grip on the Underworld?, Answer:No
Fact1: Hades alone can allow passage out of the Underworld. Fact2: Hades created a terribly difficult task for Orpheus to complete to bring Eurydice from the Underworld.  Fact3: The subjects of Hades in the Underworld are under his complete control. 