At a closed KGB psychiatric sanatorium near Minsk, agents with post-traumatic stress disorder were treated with experimental light therapy. In 1984, the experiment spiraled out of control: the patients' shadows began to lag behind their movements, then became autonomous. Surveillance cameras showed black silhouettes literally lifting people off the floor and dragging them into the pitch-black air ducts. How did special forces clear the building if bullets couldn't penetrate the darkness, and why is the area still illuminated 24/7?