Bunker Garzau, Military bunker in Garzau-Garzin, Germany.

Bunker Garzau is an underground concrete facility hidden below ground with two levels and rooms containing old military computers and communications equipment. The structure was designed to protect sensitive operations from above-ground threats during wartime.

Built from 1972 to 1975 by the East German Ministry of National Defence, Bunker Garzau carried the object designation 05/206 and served the National People's Army as an organisational and computing centre (ORZ). Its staff compiled daily reports on troop strength, stocks and incidents from all branches into an operational information system for the ministry. In an emergency, the day's data would have been read into an identical computer in the Harnekop bunker.

The computing centre ran on ESER mainframes from the Comecon programme: two ES 1040 machines until 1985, then ES 1055. Its "Operatives Auskunftssystem des Stabes" compiled daily reports on troop strength, stocks and incidents from all branches of the National People's Army for the Defence Ministry.

Visitors can explore the underground rooms and old technology on guided tours at the site. It is best to check opening times in advance, as visits follow a scheduled program and may require registration.

In an emergency, the bunker at Harnekop would have read Garzau's daily data on an identical computer. Garzau's ORZ compiled reports on troop strength, stocks and incidents from all branches of the National People's Army for the Defense Ministry. The site could run self-sufficiently on ship diesel and be sealed hermetically for 24 hours.