Related Clues:

• Immeasurable chasm
• [Gasp!]
• Gap
• Vast gulf
• Speed skater Apolo Anton ___
• Depths
• “Say it isn’t so!”
• 'Dear me!'
• ''This is bad!''
• ''Oops!''
• Immeasurable void
• Bottomless chasm
• 'I can't believe it!'
• Significant division
• "Yikes!"