When you dive during the daytime you accomplish two things.
First of all the plane can't see you unless he's at a pretty high angle. But water is clear. If he's pretty near straight above you he can see you clearly if you're at periscope depth or even below. If I want to ensure that most of the time I'm not seen I submerge to a depth of 100'.
Second thing it does is completely blind you. You know there's a plane up there when you try to breathe water. Which is a problem.
And that's the fallacy of diving in the morning and surfacing at night. The Germans did that with their fancy snorkels. They're underwater all fat and happy chortling about how invisible they are and how blind the enemy is. Meanwhile that snorkel is the finest radar reflector you ever did see. The Germans only succeeded in blinding themselves and putting a giant "kick me" sign on the surface. Boom! Another sub vanished and nobody survived to tell the story. They never fixed it and they died in droves.
With an American boat, you have a submarine which is designed to fight on the surface at every possible second, only to submerge if your fool life depends on it that moment. This means that you stay surfaced at nine knots, running radar. When a plane shows up on radar it is still at least three minutes from being able to see you. Dive to 100', stay there for five minutes and surface. He's gone. He never saw you.
But most importantly you are ready for combat. Your batteries are fully charged at all times. A quarter throttle diesel charging batteries burns as much fuel as a diesel with fully charged battery burns wide freakin' open. Playing ostrich cuts your range too. Drastically!
Captains don't let captains play ostrich. Fight your boat! Don't hide.
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