Related Clues:

• Submerged ridge of rock near the surface
• Submerged ridge of rock or coral near the surface
• Submerged ridge of rock or coral
• Submerged ridge near the surface of the sea
• The Great Barrier ..., Australian natural wonder
• Thus one forces about a thousand piles
• That's not the sound of Granny on the rocks
• If the ship is stuck there one might be able to get it free
• Not, by the sound of it, on the rocks
• By the sound of it, it's not Granny that has it on the rocks
• Not the sound of rock
• Might be free, but shipping on it is not free
• Shipwreck site, perhaps
• Ship's hazard
• Underwater obstacle