The Walled In (1969)

Directed by Vojislav 'Kokan' Rakonjac

A guard prevents the inmate's escape from the prison. During his second attempt, the inmate decides to save guard's life who have been fallen into the river while trying to catch him. Since the guard's job is now to keep an eye on him in the cell, they spend a lot time together and their hatred turns into a sincere friendship. The guard wants to help inmate to escape again.