In present day, when a u-boat dive, when the officer says the order, all of the command center crew repeats that order.
One can see on the youtube videos from U-31 patrols. I do not know if this come from previous times or not.
In terms of media, Das Boot does not gives us this scene in dives (not consider alarm/ emergency dives) but the series does gives this.
From readings, divings where normal standard routine, diving during the day, surface running during the night.
Otto Kretschmer has as normal patrol procedure/tactic diving 2 hours before sunrise and surfacing 2 hours after sunset. So during that routine, the officer of the watch would give the order, normally the watch crew would be the dive planes crew and so on.
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