Agree with what Frau said. The waters around Scapa are fairly shallow so you might've been scraping the bottom.
I spend most of my time on the surface so far as late as 1940, and that was 12 patrols in on my last career. Your watch crew should alert you to anything if you stay up there, then its an easy case of crash diving if a hostile DD comes your way.
Others can probably advise on the best time to remain submerged during the day later in the war, but early on being on the surface beats submerging for the day hands down.
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