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> There's a 20 minute running street battle at the end with tanks and explosions that is shot in a single take.

Strictly speaking there's a cut hidden in the middle of it somewhere.

I think it's when they first enter the building and droplets of water get on the camera lens but are quickly removed in the next couple of frames.

Well, it's still an incredible achievement

Absolutely! Children of Men is one of my all-time favourite movies.