Firestorm, from Netflix.

This is a fairly recent documentary about the bombing of German cities in WW2. Lots and lots and lots of archived film, both Allies and German, of the events, most of it in color. Interviews with participants on all sides. I didn't feel it was a rehash of older documentaries I have seen. The main thrust seems based on recent work by a German historian who shows us around a bit, including through an old bomb shelter. Apparently these were built in all German cities with reinforced concrete walls 2 meters thick and ready for a direct hit. They still exist, never demolished due to their mass and strength.

Jimski