Kanal (1957 Andrzej Wajda)

Wow. Becomes surreal indeed in the dark, dark sewers, where Vladek Sheybal goes mad (what happens to him?) and almost everyone is caught. Distinctive soundtrack, the darkest photography, a satisfyingly downbeat ending. Only Daisy, we suspect, might be a survivor. Funnily enough, no mention  of the smell (except at the beginning, when she's been walking the sewers).