Regarding point #4, most torpedoes do have a maximum operating depth. For instance, the US Mk48 ADCAP has an officially rated depth of 800ft (~260m), but most people estimate its capability at ~800m. Although they are capable of going quite deep, there is a depth at which water pressure will render them inoperable. I remember reading about WWII torpedoes, when they had exhausted their fuel, sinking until water pressure crushed their impact fuses, which blew up the warhead.
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Vanvikan, Feb. 2009: ordinary human, KIA, night 4
HMS Thanatus, May 2009: ??? human, KIA, night 7
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