Hard to tell. Use the "play" button and watch them under time compression is the best bet.
Quite a few IJN subs were sunk by USN submarines. Many as the rteult of ULTRA information. IJN subs were very "chatty" and we DFed them as well. Their undoing (related to ULTRA) was that they were tightly controlled from home, and had specific noontime lat/long to be at on specific days. We'd read their mail, send a sub to wait there, and boom.
Might make sense to have a few make frequent (once a day?) contact reports.
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tater
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