The majority of unsinkables i've seen where encountered in ports, where i'm thinking the torpedo impact was felt by the dock rather than the ship (the ship does not even move/bob in the water once it takes a torpedo under the hull).
I've encountered extremely tough Cargo's and a few tankers before in convoy, i know for a fact not to waste another torpedo on the ship if it doesen't move at all when it takes a hit, if you hit the ship and it wobbles or bobs a bit, she will sink!
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