Possible Clues:

• The underworld before turning under
• Before there's transport, where the Hades would you find him?
• Before the transport is here there'll be darkness
• Is there e'er a bit of public transport down here?
• Antarctic observatory mount
• Get down to it before transport comes at last
• That's before trnsport gets down there
• Dark creature of mythology
• Volcanic mountain in Antarctica
• Is there e'er a bit of public transport to get me to Hades out of here?