From Star Trek Online Wiki
It is a high security facility manned by holograms led by The Warden and controlled by the I.S.I.S. software.
As of 2409, the persons incarcerated at Facility 4028 included:
- Alevant (Lethean)
- Amar Singh (Human)
- Female Changeling
- Inmate 91856 (Tholian)
- James Fadi Mehra (Human Augment)
- K'staa (Gorn)
- Makkan (Cardassian)
- T'Vix (Undine)
- Taris (Romulan)
 Missions Involved
- “Facility 4028”: When you visit a mysterious Federation holding facility to seek aid from an old enemy, you'll find that you aren't the only one that wants her blessing. The Female Changeling and other prisoners are freed from the prison as a group of Jem'Hadar attack Facility 4028.
 Assignments Involved
- Assignment chain: Facility 4028 Fugitives: The Federation and the Klingon Empire conduct covert operations to re-capture some of the Facility 4028 fugitives.
- The uniforms and equipment used by the holograms staffing Facility 4028 are very similar to that of the MACO ground set Federation players can obtain.