Related Clues:

• Ice mounds
• Snorkeling spots
• Scuba spots
• Large masses of floating ice
• Ridges of rock or sand beneath sea surface
• They're rocks, but, by the sound of them, not
• Dangers to shipping or not, by the sound of them
• Perhaps one frees the ships form them
• Frozen floaters
• Places to scuba
• Shortens sail on seeing dangerous rocks
• Nautical hazards means one shortens sail
• Submerged ridges of rock or coral near the surface of water
• Coral Sea hazards
• Living coral communities