[Paul Riley]

I saw a doc. about something like that.A german UBoat was going,somewhere,unaware it was being shadowed by a British sub.They managed to plot the UBoat's course completely blind,setting themselves up for a 3 stage attack,with something like a few minutes between shots (I think).The UBoat immediately picked up the first incoming torpedo,ordered a steep dive,causing the torpedo to pass over the top,again,they heard another,same again,and a 3rd,which slammed into the UBoat destroying it.

I forget what was on board the UBoat,or where they were going.I think it is a different story than the Japanese cargo mentioned before,and I may be wrong.