Gmail - Poured Cement Ballast

I was wondering is that how some sites might have been constructed using ships as breakwaters also. One site I happened to come upon in GoogleEarth is on the north shore of Long Island, NY just east of Friars Head and west of Roanoke Point I think. The satellite photo shows 4 or more ships (240'+) sunk to create a secured egg shape (broken at which end? hmm...) harbor. Other than this recent visual, I haven't a clue to their purpose, though I once hear rumors that a sub-base or other coastal defenses were in place near the Old Field Light or further east. Anyone know? If the GoogleEarth program is accessible I have a location for it there under "Fun and Games" (on their BBS).