That’s exactly right about the repeating of the orders. This was very important and known as “BÜ” (Befehlsübermittlung). This was practiced heavily and had a set of very specific protocols.
The Kretschmer thing was diving for a period of two hours before sunrise (To rest the crew, to clean the boat, and to trim), but he was surfaced during the day. During his slice of the war, they had really no reason to stay submerged during the day nor was it German protocol to do so.
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