The Gateway Program is a $16 billion project to build new tunnels under the Hudson River to improve service for Amtrak and NJ Transit trains. But as the project prepares to break ground, they have uncovered some mysterious — and some historically illuminating — obstacles, including a totally unaccounted for staircase to nowhere, pig bones from the Meatpacking District's meatpacking days, and a bevy of wires, cables, and other infrastructure dreamed up by the engineers of yesteryear. Stephen Nessen, transit reporter for WNYC and Gothamist, talks about the discoveries, and how Gateway crews will have to work around these buried treasures from the past.