An abandoned space colony on Phoebe, one of the Jupiter's moons.
This map is taken from the sixth Russian Doom Community "tuning contest", where participants had to improve a computer generated map while keeping the original layout intact. I've modified it a little since then, so it should work under PrBoom+ instead of ZDoom.
Russian Doom Community: Falcor (organisation of the contest), Memfis (advices on sound formats and assistance with uploading wad to idgames), many others. All the people, whose textures/sounds i've borrowed for the project.
Doom Builder, Slade 3, XWE 1.16
Minor HOM's on TNT-based transucent doors. Projectiles flying through glass textures.