New York City Contributed Hundreds Of What To Build A Massive Artificial Reef?
  1. Postal Delivery Trucks
  2. Subway Cars
  3. Shipping Containers
  4. Taxi Cabs

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via How-To Geek http://www.howtogeek.com/trivia/new-york-city-contributed-hundreds-of-what-to-build-a-massive-artificial-reef/