A short history of the Toplitzsee compiled by Albrecht Syen
The Fischerman's Hut of Toplitzsee
There was a naval testing station at Toplitzsee from 1943 to 1944. They experimented with different explosives, detonating charges of up to 4,000 kg at different depths. The explosive strength of these underwater experiments was measured by means of copper diaphragms.
Underwater rockets were fired from a launching pad in the lake toward the Tote Mountains. These torpedoes would be used in submarines as defensive weapons.
As the end of the war approached and the allies got closer, amunition, weapons, explosives and documents of the tests, were sunk in the lake. In April of 1945 under the strict supervision of the SS guard, many crates were transported to the Toplitzsee and sunk.
In 1959 the German magazine "Stern" sent investigators, who started diving in the Toplitzsee. They found crates of counterfeit British money, piles of secret documents, including orders for Hitler's Schutzstaffel. They even found a printing press used in a Nazi counterfeiting operation.