During the war, Ząbecki secretly watched the railway line from Siedlce to Małkinia Górna junction, which was shown in the film together with his clandestine work for the underground, and his daily recording of data.
major variant of KM6 line from Warszawa Wileńska station to Małkinia, through Wołomin, Tłuszcz (Warszawa – Tłuszcz is the most frequent service)
Before the German occupation, the mega quarry was owned by the Polish industrialist Marian Łopuszyński who built a railway track connecting the mine with Małkinia–Sokołów Podlaski junction.
Even if he could not be shown to have been criminally involved at Hadamar, Hirtreiter did confess to having worked in a camp near the Polish village of Małkinia where Jews were killed in a gas chamber.