Like I've said before, the Wurrfler did NOT need to travel submerged for the entire journey.
Wiki and IMDB? How reputable!
A month ago, you know squat about the subject.
I guess you’ve never heard of a snorkel on a submarine? This device would provide air intake to the diesel engines
which would allow them to function and the sub would NOT have to rely on batter power alone. I’m not going to
bother quoting anything because you can look it up yourself. (Please, don’t come back a tell me that snorkels
were not in use in 1936. The films are full of anachronisms and you know that.)
Given the FACTS, what's the score? Stoo: 3, Spalko: 0
Well, I’m not German but knew enough about subs back ’81 to be puzzled by the scene. If there was to be no notion that
the U-boat dove then the sound effects, dialogue, etc. wouldn’t have been there. Let's forget the comic & deleted shots.
There is enough information in the film itself to show that sub goes under. (Why and for how long is anybody's guess.)