CAPE MAY, N.J., July 3 -- The hollowed hulks of 50 obsolete New York City subway cars were dumped into the Atlantic Ocean off South Jersey today to begin a watery new life as a haven for fish. [...] Recreational and commercial fishermen extolled the subway cars as welcome additions to the artificial reefs, which are piles of old Army tanks and armored personnel carriers, tons of concrete and other construction debris, and scrap steel. The reefs first attract mussels, barnacles and tiny plants. Then sea bass, tautog and flounder come to feed on them. Later, bigger game fish, sometimes tuna and sharks, arrive.