I'm in the middle of an S-Boat cruise from December of 1941 right now. I still find that yo-yo works best, crash diving on sighting a plane if it is headed in my direction. I am spotted occasionally, but there is no way to avoid that without radar. When I am in a dense aircraft environment I run decks awash. That way submergence is instantaneous and no plane can catch me.
Relying on my lookouts, at least I am aware of the danger and can avoid it. Choosing to be blissfully unaware of the danger by traveling submerged during the day, when I can be easily spotted, leaves me with no avoidance options. I'll take my chances on the surface. Contrary to Dr Oppenheimer's famous motto, ignorance is not bliss. It is death.
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