I wanted to add some additional information from the region I am living. The history of the town is often described as dark, most of what happened is not allowed to be talked about. The camp, has been totally destroyed after war, and now a small village was built on it, only the old entry is still standing.
The tunnels in which the rocket parts were tested are one of the last memorys which were original to the time. Also the place were the SS baracks were standing has been destroyed. I will have to make pics myself from them when I have a little more time.
Here some info I found:
The SS Camp:
The Ebensee concentration camp was erected as a labour camp subordinate to the Mauthausen concentration camp. The first inmates arrived in Ebensee on 18 November 1943. Until the time when the construction of the first barracks was finished, the prisoners had to stay in a storehouse of the weaving mill. To cover up the existence of the camp, SS officers used the code names Kalk (limestone), Kalksteinbergwerk (limestone mine), Solvay and Zement (cement).
The main purpose of Ebensee was to provide slave labour for the construction of the enormous underground tunnels which were to be used for research purposes and the development of the A9/A10 Interkontinentalrakete (intercontinental rocket). The original plan had to be given up as other productions of military importance were assigned a higher priority.
Apart from a few exceptions, all prisoners were registered in the Mauthausen concentration camp and then transported to the subordinate camp in Ebensee. According to the camp registers, 27,278 male prisoners were incarcerated in the Ebensee camp between 18 November 1943 and 6 May 1945. About 1,500 camp inmates were transferred from Ebensee to other subcamps, e.g. to Redl-Zipf (code name Schlier) or Wels and after several months brought back to Ebensee; as a result these prisoners were registered in the camp records a second time. From January 1945 onwards, transports with masses of prisoners arrived from evacuated concentration camps and led to an unbearable situation and the complete breakdown of supply. On 23 April 1945, the number of inmates in the Ebensee camp reached its peak with 18,509 prisoners. Members of the SS command tried to bring about the death of the new arrivals most of whom were of Jewish origin and therefore to minimise the number of camp inmates.