Related Clues:

• Titanic downfall?
• Hazard to navigation
• "Lulu" composer Alban
• A kind of knot
• Boating hazard
• Floating ice
• Great Barrier, e.g.
• Arctic floater
• Titanic mass?
• Ending for Spiel or Gold
• Site of a shipwreck, perhaps
• Floating ice block
• Arctic menace
• Lagoon creator
• Big ice mass