Possible Clues:

• Realm of the dead
• Mythical place of the dead
• Get down to it before you get to the transport
• Mount __ (Antarctic volcano)
• In Greek mythology, the dark and gloomy cavern between earth and Hades
• Fictional detective tracks low-class inhabitant of the underworld
• In Greek mythology, the god of darkness, son of Chaos and brother of Night
• Volcanic mountain of Antarctica
• Religious teaching backed virtual transport perhaps in Greece ¿ God, it¿s close to chaos
• Place of darkness on the way to Hades