On 5 July 1942, the German battleship Tirpitz was attacked by the Soviet submarine K-21.
Notes on verification
Corroborated by uboat.net, Wikipedia, and Military History Fandom wiki, all agreeing on date and outcome (attack occurred, torpedoes missed).
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)