Since 2001, Delaware has sunk more than 700 retired New York City subway cars off its coast to build the Redbird Reef, and within a few years each stripped steel shell had grown a coating of mussels and sponges thick enough to support fish populations far - ScienceBlog.com

Since 2001, Delaware has sunk more than 700 retired New York City subway cars off its coast to build the Redbird Reef, and within a few years each stripped steel shell had grown a coating of mussels and sponges thick enough to support fish populations far    ScienceBlog.com