What system can adequately reproduce the sounds of a tanker being hit by torpedo ?


Not sure. For home listening I would go with Studer A820 deck, Gryphon Mephisto monoblocks and Gryphon Kodo speakers. But there might me other options. Still, an almost impossible task, I guess.
inna
Once upon a time I used to work in a group of submariners, including sub skippers. One story they told was recording the clicking sound of a school of snapping shrimp 🦐 and overlaying that sound over voice communications when transmitting. The receive submarine also had the shrimp 🦐 overlay in the receiver so the voice message could be recovered by removing the overlay. That’s back before spread spectrum communications.

https://youtu.be/rU_gKrKWECQ
Geoff, OK. Now if you were working with or even talking with Hedy Lemarr you would have some serious interest for us, your humble readers. What a lady and story.
I’m somewhat familiar with Hedley Lamarr. Is that close enough? 
I would just love to be able to say yes, but you've pulled up a little short.  But maybe you can offer a line of "Brilliant Beans" to compliment the pebbles.  Remember where you got the idea when you hit it big.
I have never heard the Memphisto/Kodo combination. Nevertheless, I do believe it will be impressive. But I also dare to state that that set-up will stay far behind the actual impact of real explosions. (Glad they don't reproduce that kind of sound pressure). I can confirm that the Mempisto is a very, I mean VERY good amp. I have owned one of those for quite a while, will never disappoint you.