Cold Station 12 was a space station built on an asteroid that was used to store viruses and diseases for research purposes.
During the 22nd century, C-12 was a top-secret facility jointly operated by United Earth and the Denobulans under the Interspecies Medical Exchange program. It also held 1,800 embryos of 20th century Augments from the Eugenics Wars.
Cold Station 12
In 2154, the station was raided by Arik Soong to steal these embryos. In the process of escaping Soong released dozens of pathogens onto the station. It was predicted that it would take a year to decontaminate the entire station. (ENT: "Cold Station 12")
Interior schematic of C-12
C-12 survived well into the 24th century. Matthew Donahugh served on C-12 for two years, doing research on infectious diseases. (Star Trek: Remington)
External link[]
Cold Station 12 article at Memory Alpha, the canon Star Trek wiki.