[Torplexed]

I know of no instance where a Japanese escort ever tried to use a torpedo on a submarine. If he did he probably would have been chastised for wasting such a powerful asset on such a small target with a relatively shallow draft. Torpedoes were mainly used by the surface Japanese fleet in salvoes as the ultimate first strike weapon in night surface battles. They weren't cheap weapons like shells. Besides, with torpedoes being mounted in multiple tubes on the beams they would have taken quite a bit of manuvering to bring to bear which means more time for an radar equipped US sub to get wise and get away. The standard procedure upon surprising a surfaced submarine would have been to open up with the quick firing surface guns by which time any US submarine skipper worth his salt would have pulled the plug and gone under.