Related Clues:

• Ocean depths
• Wide divide
• Bottomless depth
• Big chasm
• Stunt rider's crossing
• Grand opening?
• Immeasurable depth
• It's unfathomable
• Deep, dark pit
• Big gulf
• Deep opening
• Large breach
• Deep void
• 'Ghosts of the ___' (James Cameron documentary about the Titanic)
• Wide gulf