This is the Bottany Bay. It is the sleeper ship used by Khan and his people to escape the eugenics wars on earth in the nineties. The ship was found by Kirk, and Khan was awakened. He showed his gratitude by taking over the Enterprise and almost killing Kirk. Kirk left him and a traitorous crew member on Ceti Alpha 5, which eventually made Khan angry leading to the movie, Star Trek II, the Wrath of Khan.