Supposedly, early war, the Japanese naval doctrine was that since no boat could survive depths below 300 foot, that therefore their depth charges didn't need to go that low. Probably a detonator issue. Mid to later war, they could go deep. Very deep. There are definitely much more knowledgeable folks than me about that, that could probably give a more accurate time frame for that.
One thing to keep in mind though, and this has happened to me on more than one occasion, is that the Veteran and Elite destroyers are much more "efficient" with their drops throughout the entire game, and seem to routinely ignore "early war Japanese Naval Doctrine"...
"Sir, we have flooding - Sir, the pumps are damaged - Sir, our batteries are damaged and leaking - Sir all our electric engines have been destroyed - Sir..."... blub blub blub...
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