Based on an actual war time event of 7 members of 3. company of "Drina" battalion who were tasked to guard the bridge outside the Brodar tunnel near Visegrad, Bosnia and Hercegovina in September, 1992. On the 4. day of the guard duty they were forced into the tunnel by Bosnian forces where they were trapped for the next 9 days during which 3 members of the group were killed, 3 managed to escape and one remained behind to cover them.
For the 100 days of the shoot, the only food for the crew was frozen hamburgers prepared in a microwave.
Many scenes in the film were shot in areas within Bosnia that were affected by the fighting during the war. The war was still ongoing during filming.
As of 2016 it was included in the #100 Serbian movies list (1911-1999) and protected as cultural heritage of great importance.
The song that Velja sings is called "Bacila je sve niz rijeku (she has thrown everything down the river)" by a Yugoslav rock band called Indexi.