additionally with the proposal "put together a list of known corporate MDM server URLs in a public repository" I think the idea could be to only block users with an MDM server from that list. of course that would have to be quite a large list and maintaining it fairly could be a challenge
Not only did the magnetic fuses not work, the impact fuses would collapse and fail if the torpedo made a direct hit. And the torpedoes would consistently run deeper than they were set to. US torpedoes in the early stages of the war were nearly completely ineffective.
It was before most of our times, but I don't think the Esso brand was "in the mud" when they rebranded to Exxon and that seems to have worked out ok for them.
Even at submarine depths, the oceans are poorly mapped. In 2005, the USS San Francisco collided with an uncharted (but suspected) seamount at 160m depth.