Abandoned Mystery is an interdisciplinary project exploring the phenomena of abandoned military sites in the Baltic Sea area. In cooperation with partners, the researchers organised field-trips to abandoned places in Russia, Lithuania, Latvia and Finland. This film is based on the expedition to Latvia between the 3rd and 6th of May, 2012. The researchers visited the former Soviet military centre in Irbene with the world’s eighth-largest radio telescope and the Libava fortress, the most expensive and ambitious project of the Czarist Russian army on the Baltic sea, taken over by the Third Reich and then the Soviets.