This is a "ghost prisoner" ship.
Latest info on the Watkins from here.
 Position Received: 2020-03-31 19:22 UTC
 5 minutes ago
 Vessel's Local Time:
 2020-03-31 15:22 LT (UTC -4)
 Area: USEC - US East Coast
 Current Port: NEW YORK
 Latitude / Longitude: 40.62833° / -74.06233°
 Status: At Anchor
 Speed/Course: 0.1 kn / 254 °
 AIS Source: Terrestrial AIS
See bitt’s post at 1032. Medium speed roll on/off vehicle carrier. We noticed it at sea the other day when the USNS Comfort was reroute to NYC and discussed it on the previous thread.
That being said, I suppose they could haul whatever they want on it.