The ship's courtroom (located due east of the Chapel) is still warm. Most of the station has proper atmosphere, but is freezing due to multiple hull breaches and is not survivable without a space suit.
The main portion of the Derelict is only slightly more hospitable than space itself. The derelict and the derelict teleporter are now randomized ruins, along with everything else in space. The Derelict's teleporter is the best way to get back to the main station from Space (unless you have external airlock access or can hack doors to get into Telecomms from space). The most important feature of the Derelict is its teleporter, located in a small room due south of its chapel that is not attached to the rest of the station.
The easiest way to end up at the Derelict is to launch yourself out of the mass driver in SS13's chapel, which will send you on a high-speed journey that will put you at the Derelict's Chapel. It is by far the largest structure in the space around SS13. In-Game, the Derelict is where most things thrown into Space eventually end up. The "KC13" sign in one of the Derelict's hallways. Contrary to the Nanotrasen story, KC13 was most likely a predecessor to the modern Space Station 13, as both stations contain near-identical technology and a similar layout. Nanotrasen officials have denied knowing anything about KC13 or the bombing. "Space Station 13") was a highly secret plasma mining and research station allegedly launched by the Third Soviet Union in 2544, and destroyed two years later in a bombing by the Syndicate, ultimately becoming a derelict vessel. Intellicard, EMP grenade, two red space suits, one red space helmet, two syndicate toolboxes, pAI, spare parts for the singularity engine, amongst many other things