The submarine K-21 fired four torpedoes at the Tirpitz from a considerable distance on 5 July 1942.
Notes on verification
Confirmed by multiple independent sources (uboat.net, kbismarck.com, Wikipedia article on K-21) citing consistent details on torpedo count, date, and long firing range. Soviet-era claims of hits are contradicted by post-war hull inspection, but this does not affect the core claim's accuracy.
Sources
- Attack on the battleship Tirpitz by submarine K-21 (en.wikipedia.org)
- https://uboat.net/allies/warships/ship/5126.html (uboat.net)
- https://www.kbismarck.com/tirpitz.html (kbismarck.com)