Star Trek 2200
Neptune Yard was originally a Top Secret holding facility for experimental ships and ship parts. Then, it became more of a place to store older designs for future study. Eventually it became a junkyard, a dumping ground for items that were in some sort of limbo state with The Federation and or Starfleet. Today, it is these previous layers and more, 80,000 cubic kilometers of hulls, hulks, junk, bits and parts.
In the last few years, the Yard has come under the command of Admr. Grace. Grace took stock of the contents of the Yard and once he established his team he passed the list of interesting ships along. In Slot 19 was indeed a special ship; the USS Hawking.