Related Clues:

• Traditional location of one of this puzzle's theme words
• With 66-Across, like water that's behind you?
• Out at the dentist's?
• In the basement
• Subject to the authority of
• Not on deck, maybe
• *Submerged
• Because this is beneath oneself, don't think it's over!
• Secondary to
• Not on deck, say
• Concluding you can find the answer below
• "Look out ___!"
• Answering to
• One of two engineering features depicted in this puzzle
• Feel blue and down