Kolkwitz Bunker, Cold War command post in Kolkwitz, Germany

The Kolkwitz Bunker is an underground military facility built with reinforced concrete structures spanning three levels across a foundation measuring 42.5 by 18 meters.

Built in the mid-1960s alongside the Cölpin bunker and drawing on lessons from the Kagel bunker, the Kolkwitz bunker entered service in 1967 as command post GS-31 of the 1st Air Defence Division of East Germany's Air Force/Air Defence. It coordinated fighter regiments, surface-to-air missile units and radio-technical troops, and its signals centre linked the NVA with the Soviet forces. After 1990 it was decommissioned and later turned into a military-history museum.

Since 2004 the association Kolkwitzer Bunkerfreunde GS-31 e.V. has run the site as a military history museum and offers guided tours; it is a member of the Bunkerallianz Berlin-Brandenburg. The bunker's own news centre was integrated into the NVA communications network, linking the command post with the Ministry of National Defence, the LSK/LV command in Eggersdorf and the central command post in Fürstenwalde.

Tours run on the second Saturday of each month at 9:30, booked by email, contact form or phone; a second tour is added when demand is high. Special tours can be arranged on request. The bunker lies about 12 km west of Cottbus in Kolkwitz, at the edge of the "Am Technologiepark" commercial area, reached via the A 15 exit Cottbus-West or the B 115 between Vetschau and Cottbus.

The bunker's communications centre was run by the 31st Signals Battalion of the LSK/LV from Cottbus, which tied the post into the NVA network. Links ran to the Ministry of National Defence, the LSK/LV command at Eggersdorf, the central command post at Fürstenwalde, the border troops and Interflug's civil facilities. Wire, radio, directional radio and tropospheric links were mostly operated encrypted.