One director you never hear mentioned here is Polish master Andrei Wajda. His WWII films Ashes and Diamonds and Kanal are some of the best movies ever made.
Kanal is about the failed Warsaw uprising and tells the story of Polish freedom fighters trying to escape German encirclement through the sewers. The dark, wet, airless sewers, are like the corridors of hell. Soon fear, confusion, exhaustion, and madness take hold as the group desperately tries to reach daylight and freedom.
Ashes and Diamonds takes place right after Poland is liberated by Soviet armies, with the Russians sidestepping the Polish nationalists in favor of Moscow grown Polish communists. The heroes that fought the Nazis are now once again hunted, this time by their alleged liberators. The movie follows two Polish freedom fighters who spend a night at an inn on a mission to assassinate a Soviet agent.
I love this image.