There are a number of penitentiaries whose reputations precede them—whose very names strike fear in the hearts of the state's enemies. This facility wasn't one of them. Midnight wasn't about reforming criminals; it was about making them disappear.
The Midnight Facility is a top-secret prison facility operated by the Office of Naval Intelligence in the 26th century. It was intended to house high-profile political prisoners who the organization preferred to make disappear rather than execute or rehabilitate. Midnight was located in an asteroid field.
In 2553, Subject Denver was interrogated. When Denver was explaining his escape from High Charity he made reference to seeing a "A blue female human artificial intelligence". Subject Denver also believed she was suffering from the Logic Plague; a Flood condition that his interrogator Oberon 5 didn't know.