The midget subs? Among the most noisy in the world. And they don't have any sensors beyond their periscopes, either, so pinging is safe.
If you couldn't detect them with 400ft of water, you must have been doing something wrong. What were the distances like? Was the bottom type the default rock, or was it the more sonar-limiting sand or mud?
Are you sure you were not dragging the TA on the bottom?
And the case of spotting one, was possibly a MAD detection from the helo. If it dropped a torp on its own that's very probably the case, since that only happens in lwami on a mad contact.
The hull sonar, in passive mode, is infamous for being useless.
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