The booty included gold, diamonds, jewelry and pieces of art as well as secret files and scientific documents from the Kaiser Wilhelm Institute.
Based on documents found in 1993 in the Weimar area, some experts believe that the Nazis hid the stolen goods and the missing Russian "Amber Room" in these tunnels.
[citation needed] Only one person, German Helmut Gaensel, claims that he possesses the original documents about the contents and has exact knowledge of the location where this alleged treasure is hidden.
He says that he received these documents, additional information and a specific area map from Emil Klein [de], the former SS general in command.
In 1992, Gaensel bought the relevant property and signed an exclusive agreement with the Czech authorities to obtain the sole rights to unveil the treasure.