The German squadron did not detect the submarine K-21's torpedo attack on 5 July 1942.
Notes on verification
Confirmed by multiple independent sources, including detailed historical accounts referencing German documents and Soviet records, consistent in describing the undetected torpedo attack. [tier=unverified indep_score=0.3 clusters=3 claim_tier=notable] [rescored 2026-09-15: curated origin-host map (PR #65); unclassified hosts no longer scored as aggregators]
Sources
- Attack on the battleship Tirpitz by submarine K-21 (wikipedia)
- https://warhistory.org/@msw/article/k-21-versus-bb-tirpitz (corroboration)
- https://www.kbismarck.com/tirpitz.html (corroboration)
- https://en.topwar.ru/36127-ataka-na-tirpic-obstoyatelstva-podviga-k-21.html (corroboration)