The untrained eye might not notice this as anything different from a rock, but this pictured is actually the muzzle of an 18th-century nine-pound gun.

To the untrained eye this might look like a rock, but it's actually the muzzle of an 18th-century nine-pound gun. Objects protruding from the sea floor, like this one, are known as “proud” objects. Images Courtesy of Rod Mather, University of Rhode Island.

 

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