Not on the list, but ASW mortars like the RBU-6000 are almost 100% deadly. I have never once been engaged by ASW mortars and come out of it with anything less than heavy damage.
As for the list, air dropped DC's and wire guided torps tied for first. I believe Bears can drop passive sonobouys as well, which you can't detect, and they can then track you easily. Just about no warning of the attack, and little chance of evasion. With wire guided torps your only chance is to sink the vessel guiding it, or be a very long way off when you start running.
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There are no great men, only great challenges that
ordinary men are forced by circumstances to meet.
-- Admiral William Halsey
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