Ok, perhaps not designed, but intended.
We also know in the books that Soviet naval power, hell, all naval power of note, was on the bottom very early on (before the nukes I believe). There may well not have been time to lay minefields of any size in far off places.
You can be sure though that surface ships would have a very hard time even attempting to mine a foreign port or shipping channel.
However, even just one mine, or the rumour of mines can create delays and fear in ship crews.
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If it moves, shoot it, if not push it, if it still doesn't move, use explosives.
Nothing happens in isolation - it's called "the butterfly effect"
Mors ante pudorem
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