The Falkenhagen Bunker is an abandoned semi-submerged and bunker-level military industrial complex, just north of the town of Falkenhagen in the district Märkisch-Oderland, in Brandenburg, Germany. It was originally designed by Nazi Germany for the production of N-stoff (chlorine trifluoride); it never reached its potential before being overrun by the Soviet Army in 1945. The site was eventually reconstructed by the Warsaw Pact to become its main command and control bunker outside the Soviet Union.