First Referenced:
'I was told that everyone I'd served with in the military died shortly after I left.'
Teskoy Prison is a penal facility under the control of The First World. It is a pocket universe from which nobody has ever escaped, and is where The Sword, pending his trial, as well as the unnamed brunette woman have been incarcerated.
The Teskoy Prison pocket universe is situated part way within the multidimensional inner shield that protects The First World. It is little more than a splinter universe, which contains a version of Earth and not much else, lacking both stars and a sun or solar system. The planet has no sources of light or heat besides that generated internally or through dimensional friction. All inhabitants of the planet otherwise live in permanent darkness, with no system of government, support infrastructure, or order.
The First World uses Teskoy Prison as a location to incarcerate, or dispose of dangerous entities and prisoners. Those held temporarily are kept in cells within a facility lodged within the wall of the reality itself, some thousands of feet above the surface of the planet below. The facility also contains a large helijet bay. Permanent prisoners are given a parachute and dropped to the planet below to fend for themselves. Occasional retrievals occur through use of the helijets.