This is style-wise a mix of the traditional mountain military base, the generic sewage processing facility and the weird off-world alien base, to put it bluntly. This is the conceptual mix of many weird ideas assimilated during a long time. There are huge, open areas with large battles as well as tight infighting in small dark corridors. I even put in some things that I usually consider to be evil and wrong, such as crusher mazes, jumping puzzles and, god forbid, a sequence where you run from cover to cover while being shot at from a distance by a cyber- demon you don't have enough ammo to take down.
Oh, by the way: Try to get 100% kills on this map. I haven't succeeded myself, but I'm pretty sure it can be done. Really.