U-Boat War
This is a set of 3 documentaries covering the U-boat's impact in WWII, from beginning to end. It is well-written, and supplemented with interviews with American, British, and German survivors (and also historians) as well as a good amount of archival footage. It is really interesting to hear the story from those who were there -- including a number of German U-boat commanders. The breadth of coverage is good, including both German and Allied tactics (and how these tactics changed during the war), as well as technical advances on both sides. Coverage also includes developments in the Allies' ability to read the German naval code. I think the most valuable thing it does is provide the human story without demonizing the German sailors.
Watch the full U-Boat War movie online at no cost in high-definition (HD) quality. No downloads needed—simply click to play and experience the excitement with English subtitles included for your convenience.