Actually, the submarine bit makes perfect sense.
I don't understand the German, and admit that part of the dialogue 'periscope' is mentioned, and it appears that they are preparing to dive to periscope depth, BUT;
1- we never actually see it dive; AND,
2- Submarines of this era did not dive EXCEPT when attacking and/or avoiding detection by the enemy. Submarines of this era actually travelled faster on the surface, and could only be submerged for VERY limited time. So, the vessel would actually travel surfaced the entire time UNLESS there was a real reason to submerge.
The captain said "tauchen", which means "dive" - and the command is repeated. Also, we see him looking through the periscope, which would be pointless if they were surfaced.
Furthermore, uboats of that era made at least one trim-dive per day, to ensure the water in the ballast tanks was of the same density as the water in their current location (it does vary somewhat). They would also travel sumberged significant amounts of time for the sake of training (not a single day without some form of training in peacetime - and also in wartime).
On top of that, if they were surfaced, they would have crew stationed topside. Where would Indy hide?
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