In Darkness

"In Darkness (Polish: W ciemności) is a 2011 Polish drama film written by David F. Shamoon and directed by Agnieszka Holland.^[1]
Based on true events during German occupation of Poland, the film tells a story of Leopold Socha, a sewer worker in the then Polish city of Lwów (taken after World War II by the Soviet Union, and now part of Ukraine), who used his knowledge of the city's sewer system to shelter a group of Jews escaped from Lwów's ghetto during the German extermination of Jewish people.
The film was nominated for Best Foreign Language Film at the 84th Academy Awards.^"