All....sounds like you were too close and the torps didn't have time to activate. Torps won't arm until about 4-500 yards, best range 600 to be sure.
Yamato takes about 8-12 torps, based on playing stock to different mods.
M14's suffer about a 50% failure rate if you have that option enabled, but sounds like you're too close since you said point blank range..
Not to forget...A ship has a blast range, simply, the explosions can reach out and destroy your sub, so don't get too close or you'll kill yourself in the process.
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