I've actually done something similar, though in-game.
I happened upon a HUGE taskforce in the China Sea, with the Yamato, some other BBs, a bunch of heavy cruisers, and a dozen or so destroyers.
I let loose a 6-torpedo volley, taking out a BB in one shot (nailed the magazine stores), crippling another one (took out all props and rudders), with the remaining torps nailing the Yamato, stopping her dead in the water.
The DDs, of course, were looking for me, but since I had fired so close to the taskforce (something like 1000m), I was able to move at flank speed underwater and end up, funny enough, directly under the Yamato. I wasn't able to get the entire sub under her, since I had come in at an angle, but the DDs were rendered useless. I shut off my engines, went all silent, and watched as the DDs went nuts trying to find me.
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