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It is possible to prepare ships to survive multiple torpedoes.
It's all about
- reserve displacement (a matter of size),
- counter-flooding (easily done and again a matter of size),
- structural strength (already very different among nations of WW2),
- dense compartmentalization (easily done) and
- shock resistance (standard since I think 70's at the latest).
Such a torpedo-hardened ship has become feasible since vertical and horizontal armor and primary gun turrets of WW2 vintage wouldn't take so much displacement anymore. A 20,000 ton ship could easily take four modern heavyweight torpedo hits and cruise home if designed to do so.
The trickiest part is to disperse the propulsion and steering.
Nobody ever designed a ship specifically for torpedo survival (but no anti-shell protection) post-45, but it's possible to do it.
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