By the end of the war they had trimmed this time to about 30 seconds. What they needed to do was cut back the conning tower fairing (sp?) and add a whole s**t-load more of free-flood holes in the superstructure.
Don't despair though. With SD/SG/SJ radar we should have ample warning to get under. Well--actually we'll be starting with SD radar (air detection) which had a pattern like a 4 leaf clover with blind spots inside the leaves. So make sure you pack extra carrots for your lookouts
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Cheers!!!