Ego

Not to be confused with the characteristic.

Ego is a fortress on Mestreet and the only fortress. It is primarily ruled by the SUI.

Description
A high-tech base with strong concrete walls, lots of guards, and even more scientists inside, the fortress is impenetrable and is of key importance in researching the strange land of Mestreet. Surely most of the funds donated to the SUI contribute to the upkeep of this massive fort.

While it's not publicly accessible and obviously not open for interviews, I have managed to disguise as a guard several times and got a few peaks around. Apparently the entirety of Mestreet is a foreign body, specifically a moon of some sort that collided with Venera during The Great Renewal. The eggheads up there say that Mestreet was linked to the Havets for unknown reasons and is probably a great indicator of what was going on at the time of the Renewal.

Unfortunately, they updated security to require fingerprints, and carrying around a dead person's finger to gain access to top-secret files isn't exactly child's play. I will have to figure out how to get in there another way.