After an August 1944 explosion at the Redl-Zipf V-2 liquid oxygen plant at Schlier stopped production, the third V-2 liquid oxygen plant (5000 tons/month)[3] was built at a slate quarry at Lehesten at the Thuringia-Bavarian border[4] near Nordhausen (acceptance testing of combustion chamber was also performed at the Lehesten plant).[3] Dr Martin Schilling (the head of testing at Peenemünde)[5] located the Lehesten site,[3] and 400 engineers were moved from Peenemünde to Lehesten, which eventually had 16 liquid oxygen production plants.[6]