Just thinking about "The Daily Routine" (Torpedo Maintenance).
The G7E torpedoes had to be pulled partialy out of the tubes, and serviced every day.
I would imagine this would have to be done submerged, and this was one of the reasons I chose for staying submerged 4 hours daily.
However, the G7A didn't share this drawback. I could probably do with much less time submerged early war.
(I consider the dives a nuisance, and often skip them, as they add much to the transit time.)
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