Columbia University’s Lamont-Doherty Earth Observatory studied the waters around NYC and the lower Hudson valley, and found a whole bunch of different stuff:

5. A Freight Train
It was carrying passenger baggage one afternoon in 1865, and failed to stop at the Peekskill drawbridge, which was open. Two men were killed.

The list of 28 things include teredos and gribbles, shipwrecks, a Formica dinette, and 1,600 bars of silver worth about $26 million. The silver sounds tempting, but you have to contend with the dead bodies.