Wait till night time.
Pop up to decks awash depth (~8m) if you are atleast 3000-4000m away. Should be high enough to replinish the CO2. And you can drive on your diesels.
If they dont spot you, drive away at that depth at half speed until you are ~8000m away then surface and run for it at flank speed.
Worth a shot. I've closed to nearly 1000m at night time on a few occcasions vs. a patrolling escort at decks awash. But he wasn't alert.. so its probably not the same.
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