In total, 3,000 tonnes of banknotes, passbooks, and checks were stored there, having been brought by military convoy from the Staatsbank der DDR in Berlin. The currency became the property of the Kreditanstalt für Wiederaufbau (KfW) in 1994 through its merger with the Staatsbank Berlin (the post-reunification name for the Staatsbank der DDR). The 13 km (8.1 mi) tunnel system had been built by forced labour during World War II, and used by the National People's Army under the code name "Malachit", or camp complex KL-12 NVA-Nr.16/630.