In January 1944, similar tunnels were also built beneath the village of Sankt Georgen by the inmates of Gusen II subcamp (code-named "Bergkristall"). They dug roughly so the Messerschmitt company could build an assembly plant to produce the Messerschmitt Me 262 and V-2 rockets. In addition to planes, some of Gusen II tunnels served as factories for various war materials. In late 1944, roughly 11,000 of the Gusen I and II inmates were working in underground facilities. An additional 6,500 worked on expanding the underground network of tunnels and halls.