Laboratory X-19 (also referred to as X-10) is a location featured only in S.T.A.L.K.E.R.: Shadow of Chernobyl.
Lab X-19 is a hidden underground lab where the main components from labs X-18 and X-16 were sent, to construct a large scale psychic antenna (codenamed Rainbow). It is located directly below the surface complex, accessed via a dead-end railway sidetrack behind the Red Forest.
The inside of the lab is mostly empty, containing up to four widely scattered Bloodsuckers. After the machinery is disabled, a large number of Monolith soldiers will start patrolling inside the lab. Once the Marked One gets to the surface, a platoon of Spetsnaz will be fighting against the Monolithians. Duty and Freedom will be in a skirmish near the road to Pripyat, and the winning faction's stalkers will almost immediately engage the Monolith squad at the top of the slope, near the transition point. Loners and Spetsnaz soldiers can be found near the exit to the Army Warehouses. In addition to these new threats, new Monolith squads may appear in places that were previously cleared out.
Inside Lab X-19, going down the stairwell leading to the lower floor will lead to a room with a numerical keypad next to a locked door. The combination for the door is 342089. The room inside contains several boxes of 5.56x45mm AP rounds, Medkits, and F1 grenades. The passcode can be found in the "Found PDA" entries in the diary of the player's PDA after the player leaves Lab X-19 with the Brain Scorcher turned off. The journal entry indicates that these were supplies intended for Monolith soldiers.
In earlier builds, most notably Build 1935, X-19 was named "Bunker X-10"; in the final version of the game, this bunker was moved and renamed to its current label. In the pre-release version, the entrance to X-10 was somewhere else in the Red Forest. In the final version, the entrance to the area was moved to the Brain Scorcher antenna grounds. Some source files still hold references to the earlier name. In-game however, the designation X-10 is never mentioned. To add to the confusion, X-19 is refered to as Lab X-10 in Call of Pripyat.
In the original Russian version of Shadow of Chernobyl, the lab was named "Lab X-10".
- ↑ "The documents describe the technical characteristics of the antenna and how they deviate from their planned values. There is a note on the reverse side which indicates that these documents were prepared in lab X10." -Rainbow emitter - main technical characteristics