Between 2001 and 2010, Delaware sank 997 retired New York City subway cars into the Atlantic, turning them into the main feature of Redbird Reef

For nearly a decade, hundreds of retired New York City subway cars left rail yards not for scrapyards, but for the Atlantic Ocean. Between 2001 and 2010, Delaware deliberately sank 997 decommissioned stainless-steel subway cars several miles off its coast, placing them on the seafloor as part of the state’s artificial reef programme.

Raccontata datimesofindia.indiatimes.com