"Go on then, Go on living without a conscience, it can be done"
Absolutely masterful how this film reveals itself, layer by layer, arriving at the moral dilemma at its' core.
One man's ascent into martyrdom contrasted with the other's descent into (what certainly seems like) a life of regret and shame. One man's stoicism and honor contrasted with the other's destabilized moral code. You can either live to die or you can die to live.
What is also worth noting is how the Nazis don't really play a huge part, instead just provide the exogenous stimulus which sets off the internal conflict and I think it's the universal nature of this conflict which really makes this film so haunting (I mean obviously there is the bleak cinematography but it's not just "there", it enhances the film at a thematic level too)