
Blacky starts operating clandestinely as a communist activist along with Marko and others. The Royal Yugoslav Army's resistance is quickly broken, and German troops soon occupy and dismember the entire Kingdom. Encountering building ruins and escaped wild animals from the zoo, he also runs into disconsolate Ivan carrying a baby chimp named Soni. After the air raid is over, Blacky goes out against the wishes of his wife and inspects the devastated city.

Suddenly, the roar of the planes is heard, and German bombs begin falling on Belgrade. Later, the hungover Blacky is eating breakfast while pregnant Vera complains about his supposed affair with a theatre actress. Marko lets Blacky's pregnant wife Vera know that they enrolled Blacky in the Communist Party (KPJ).

They pass through Kalemegdan and shout salutes to Marko's brother Ivan, an animal keeper in the Belgrade Zoo. In the early morning of 6 April 1941 in Belgrade, the capital of the Kingdom of Yugoslavia, two roguish bon vivants Petar Popara, nicknamed Crni (Blacky) and Marko Dren are heading home. It was Kusturica's second such award after When Father Was Away on Business (1985). Underground won the Palme d'Or at the 1995 Cannes Film Festival. In interviews, Kusturica stated that his original version ran for over 320 minutes, and that he was forced to cut it by co-producers.

The theatrical version is 163 minutes long. The film was an international co-production with companies from Yugoslavia ( Serbia), France, Germany, Czech Republic and Hungary. The film uses the epic story of two friends to portray a Yugoslav history from the beginning of World War II until the beginning of the Yugoslav Wars. It is also known by the subtitle Once Upon a Time There Was One Country ( Serbian: Била једном једна земља/Bila jednom jedna zemlja), which was the title of the 5-hour mini-series (the long cut of the movie) shown on Serbian RTS television. Underground ( Serbian: Подземље / Podzemlje), is a 1995 comedy-drama film directed by Emir Kusturica, with a screenplay co-written by the director and Dušan Kovačević.
