Related Clues:

• Diver's place
• Site of a wreck, perhaps
• Where a yacht might run aground
• Ocean obstacle
• Sea hazard
• Snorkeling destination, perhaps
• Mirror blurrer
• Hazard to navigation
• A kind of knot
• Boating hazard
• Steam (up)
• Great Barrier, e.g.
• Site of a shipwreck, perhaps
• Lagoon creator
• Airport delayer