I saw the structure while I was on the train, and I got off at the next station and met people there that gave me access to their catacomb-like basement, which was used for ammunition storage during the war and also, at some point, to hide groups of Jewish refugees.
Vi a estrutura quando viajava de comboio. Saí na estação seguinte e falei com os habitantes que me deram acesso às suas caves parecidas com catacumbas, usadas para armazenar munições durante a guerra e, a dada altura, para esconder refugiados judeus.