The setup certainly doesn't make it sound positive: The Redbird Reef off the coast of Slaughter Beach, Delaware is a dump site for retired New York City subway cars, and there are already nearly 700 of them on the ocean floor. Before you cry foul, consider the words of Jeff Tinsman, the Delaware Department of Natural Resources and Environmental Control's artificial reef program manager, who told the New York Times: "They’re basically luxury condominiums for fish."
Who would have thought that subway cars on the ocean floor would encourage fish to congregate? Rather than abandon the structures, fish are moving in at such a rate that the program is trying to provide more cars. What's more, the program is also facing competition from other states after its impressive success, as the city of New York offers the cars for free.