Related Clues:

• Barnaby's strength reveals hidden depths
• This could be 'Grand', as could be that
• Very deep chasm
• Deep cleft in ground
• Old Ethiopian's not half deep
• Stream erosion result
• Buoy, say, between a boat just keeps going down
• Deep narrow gorge with steep sides
• Front half of cat only — it has no bottom
• Gaping gorge
• Can way out there be so far down?
• Site for some rafters
• Seemingly endless pit
• Big canyon
• 1989 James Cameron film, with 'The'