Related Clues:
- 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
- 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
- Atoll features
- Settings of many schools
- Spots for sunken treasure
- Ridges just above or below the sea
- Divers' destinations