Torpedoes have a minimum depth, above which they become unstable and, at the very least, start to porpoise. They will also, usually, lose direction, in which case you may get your torpedo back. To all intents the gunboat is torpedo proof.
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"Pitt was the greatest fool who ever lived to encourage a mode of war which they who commanded the seas did not want, and which, if successful, would deprive them of it." Earl St.Vincent (allegedly)
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