 Item number, SCP-406. Object Class, Euclid. Special Containment Procedures. Task Force Tau-6 are assigned to monitor SCP-406 and process SCP-4061 instances. They are to be based in a converted small industrial unit at a nearby industrial park behind a foundation front company, Simon's Carpet Paradise. The emergence point and western entrance of SCP-406 are to be monitored via closed circuit television cameras. Concealed lighting and infrared sensors are to be fitted to detect and illuminate emerging SCP-4061 instances. And emergency clothing, non-perishable food, and basic first aid supplies are to be concealed behind false brickwork on the opposite wall. Two-way audio communication is to be enabled via concealed microphones and speakers between Tau-6 and the emergence point to guide and instruct SCP-4061 instances and to wake them if necessary. The gate at the open western entrance is to be kept locked. Trespassers are to be monitored and are to be detained and administered amnestics if they witness an SCP-4061 instance. SCP-4061 instances are to be retrieved by members of Tau-6 and taken to sector 25, debriefed, administered amnestics, then escorted to their point of origin. Fabricated cover stories and or amnestics are to be used to explain the absence of SCP-4061 instances. All SCP-4061 instances are to be logged and remotely monitored for a period of five years, previously 20, and detained if any anomalous properties become apparent. A proposal for covert monitoring of residents of the origin area to prevent a reduced disappearance event frequency is currently under review. Description SCP-406 is a 228-meter long disused railway tunnel in Kregelstone, England. The eastern entrance has been infilled and is inaccessible. The western entrance is blocked by a metal fence with a locked gate. SCP-4061 are persons who emerge via unknown means through the inner northern wall of SCP-406 at a point 15.3 meters from the closed end of the tunnel. SCP-4061 instances are invariably initially asleep and walking upright, but most instances wake up naturally shortly after their appearance, usually due to the sudden shock of the cold air within the tunnel. Initial inspection and testing of the emergency point was unable to identify any anomalous effects. Further testing of the emergency point is prohibited until further notice. SCP-406's first known anomalous event on record was in December 1981, when the naked body of Mr. SCP-24 was found within the tunnel, having died of head injuries and exposure after apparently tripping and falling within the tunnel. A tattoo was identified and later matched against a missing person's report in Illinois, USA. A subsequent instance of SCP-406-1 was recovered alive in February 1982, Ms. VIII, and the anomalous nature of the tunnel became apparent. The foundation became aware of SCP-406 at this point and established initial containment procedures. All instances of SCP-406-1 to date have originated in the rough geographical area of Douglas County, Illinois, and a small portion of the southern end of Champaign County, Illinois, and appeared within SCP-406 shortly after falling asleep. Instances of SCP-406-1 do not report abnormal histories of sleepwalking. To date, no attempt to witness or record the disappearance of an SCP-406-1 instance from their origin point has been successful. Current conjecture suggests that a disappearance will not occur unless unobserved. No SCP-406-1 has yet to report any memories of their time between falling asleep and waking within SCP-406, and no attempt to recover memories has yet been successful. To date, instances of SCP-406-1 have been recovered. SCP-406-1 instances are not known to be anomalous. No individual SCP-406-1 instance has appeared more than once. Document SCP-406-A. On August 14, 1989, at 1732 GMT, an emergence event occurred during exploratory drilling of the materials of the wall at the emergence point. Despite immediate medical intervention, Mrs. P.76 died at the scene. She was not known to have had any living relatives, and staff at the nursing home where she resided were administered amnestics and a cover story, heart failure. The foundation technician who was manning the drill at the time also requested amnestics. This was denied. A leave of absence was granted. Lesson complete. If you missed the previous orientation, go watch SCP-405, Telepathy Virus, right now. Or for the complete course, watch this playlist.