Related Clues:

• One in the pole position?
• Titanic thwarter
• Navigation hazard
• Titanic's undoing
• Drifting ice sheet
• Titanic problem
• Iceberg
• Titanic problem?
• Floating ice sheet
• Big chip off the old block?
• Only about 10% of it is visible
• Helmsman's headache
• Titanic's problem
• Titanic's downfall
• Pole feature