there was a vid on youtube of a harbour raid where the torpedo bounced off some crappy hull and went on to sink something else which was initially blocked from view/torpedo track.
it was either SH3 or SH4 and it was apparently just incidental (not actually aimed) but it looked dead cool
anyway... on topic: you can actually set depth to run under the smaller outer column ships to hit the bigger inner column ships etc, but I'm not sure if they actually would have tried that in real life.