On 5 July 1942, the German battleship Tirpitz was attacked by the Soviet submarine K-21.
Notes on verification
Confirmed by multiple independent sources including uboat.net naval database, Wikipedia, and detailed historical analysis. All agree on date, submarine, target, and torpedo count; the attack is unambiguous, though the claimed hit/damage to Tirpitz is disputed and not substantiated by German records.
Sources
- Attack on the battleship Tirpitz by submarine K-21 (en.wikipedia.org)
- https://uboat.net/allies/warships/ship/5126.html (uboat.net)
- https://military-history.fandom.com/wiki/Soviet_submarine_K-21 (military-history.fandom.com)
- https://warhistory.org/@msw/article/k-21-versus-bb-tirpitz (warhistory.org)