Geheimobjekt "Siegfried/Jasmin/Olga/Burg" in the Jonastal
Secret Objects "Siegfried/Jasmin/Olga/Burg" in the Jonas Valley near Ohrdruf
One of the many Third Reich construction projects that was started but never finished was a series of underground complexes in central Thüringen, southeast of the city of Gotha (near the concentration camp at Ohrdruf, the first such camp found by the Americans on German soil). This project had several code names, depending on what part was meant, and the names also changed over time - the following names were used for all or part of this complex - Siegfried, Jasmin; the designations Olga, Burg, and S/III were sometimes used for the entire project area (including the Jonastal and the surrounding area); "Olga" was also the code name for the "Amt 10" communications center bunker at Ohrdruf. The main works were dug in two sections into a hill forming the north side of the Jonas Valley, between Crawinkel and Arnstadt. This part of the project was reportedly intended as a last-ditch headquarters facility for Hitler and his staff, should they fall back from Berlin into the interior of Germany (some reports say Hitler actually spent the end of March 1945 in this or another nearby underground Führer Headquarters). Other theories say this or a nearby site were intended for production of the intercontinental "Amerika" rocket, and even testing and production of a Nazi atomic bomb. Most of the Jonastal complex never advanced much further than the tunnel digging stage, and the Soviets blasted most of the tunnel entrances after the war. The exact purpose of this facility remains in doubt, as does its code-names ("Siegfried" and "Olga" may actually have been names of other sites). (Google Maps link)
Please note that this site became part of the adjacent Ohrdruf military training area ca. 2001, and is now posted off-limits to visitors. Bundeswehr authorities take a dim view of trespassing here. The photos shown on this page were taken before the site was posted as off-limits.
Jonastal webpage -- www.jonastal.de
89th Infantry Division liberates Ohrdruf camp -- http://www.89infdivww2.org/ohrdruf/index.htm
Memorial Museums for the Victims of National Socialism in Germany -- http://18.104.22.168/gfue/de/index.html
Third Reich in Ruins, http://www.thirdreichruins.com/
All contents copyright © 2000-2016,
Geoffrey R. Walden; all rights reserved. All photos taken by or
This page is intended for historical
research only, and no political or philosophical aims should be assumed.
The author of this website is not responsible or
liable for any use(s) made of the information presented in this
This page initially uploaded on 20 July 2000.