Seeing it a second time, it might make more sense. I understood all the story lines were converging but the night scenes were confusing. The "Mole" timeline was longer than the other two.
But I thought it was pretty good. Glad there was no CGI which made the visuals all the more impressive.
While I was watching I decided it was more like a horror movie than a war movie; tons of suspense, claustrophobia, jump scares, etc.