SolarmovieOne

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.

How to Watch U-Boat War Legally and Safely

If you want to stream U-Boat War through reputable and legal services, there are a few good options depending on where you are. Subscription platforms like HBO Max, Disney+, Netflix, Amazon Prime Video, and Apple TV+ sometimes carry U-Boat War films or related DC titles—though availability depends on your country.

If you’d rather not commit to a subscription, there are ad‑supported, free (but legal) platforms such as Tubi, Pluto TV, Peacock or Crackle (where available in your region) that occasionally host superhero films.

Lastly, don’t forget about library‑linked streaming options like Kanopy or Hoopla (if your library or university is registered), and official uploads by film distributors on YouTube—these can also give you legal access to classic movies.