Possible Clues:

• Is there e'er a bit of transport to hell and gone down there?
• Eastern riddle of the underworld
• 17 across gets transport one hell of a way
• Before transport is on the way to Hades
• It was hell before public transport
• Place of darkness? You wait ages ____ turns up!
• Volcano in Antarctica
• Enigmatist's debut puzzle divided Heaven and Hell
• Antarctic volcano named for a place in the underworld
• Cavern between Earth and Hades