A sealed research facility, all of it indoors. One frame runs down a long corridor lined with octagonal concrete pillars, the ceiling banded in blue and red light strips and a red-striped access shutter closing the far end. Another stands in a lobby whose back wall is a lit panel with a double-helix emblem above a stepped concrete platform, an official seal set into the dark blue carpet at your feet. A third opens a reception area with a soda machine, a curved counter and a hanging sign for a high-security laboratory. The palette is pale concrete and grey tile, with coloured lighting doing most of the work.

Despite the cs_ in the file name there are no hostages and no rescue zone: the map has two bomb sites and plays as a defusal map. It spans 4112 × 4400 × 1488 units with 7,287 faces and 411 textures, none of them embedded, so every texture comes from the shared .wad files. Ten spawns per side seat twenty players, and the buy zones are automatic, placed at the spawns. Ten doors, eight ladders and nine breakable objects shape the movement, with four beam effects, a moving platform, a rotating mechanism and two pools of water inside the complex.