Gravesend Bay hides a potentially explosive secret, and it’s not the soup of toxins sitting at the bottom. “A HALF-CENTURY ago, an ammunition barge broke loose from the U.S.S. Bennington, an aircraft carrier anchored a mile offshore in Gravesend Bay. The barge drifted over to Rockaway Point, but somewhere along the way it overturned, scattering 15,000 live antiaircraft shells, each as long as a man’s leg, onto the sea floor.” Five hundred fifty shells were recovered. Two hundred tons of ordinance are still down there. So what happens if they dredge for a marine waste transfer station?–NYT