When the German U-boat leaves for the island in the ocean we see Indiana Jones on the outside of the deck. Any information if the U-boat traveled on the surface the entire way? If it submerged I would think he would have floated off or some how he managed to get into the u-boat unseen. Any answers out there?

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    Submarines of that vintage had limited submerged time and range on the batteries, so mostly ran on the surface to cover distance. – zeta-band Jan 8 '18 at 23:20
  • @ James McLeod- Thanks for the link, I have watched that movie many times and was wondering. I know most submarines in the Second World War era ran on the surface to recharge batteries just wish they would have shown it on screen. – dean1957 Jan 9 '18 at 0:18
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    That was much remarked at the time. I remember Mad Magazine explicitly calling it out. I just figured dude was able to heroicly hold his breath. Makes as much sense as some of his whip tricks. – T.E.D. Jan 9 '18 at 2:43
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    as @zeta-band said - the subs were submerged only when attacking or destroyed. Limited battery life and life support systems (8-10 hrs or so) meant submerging was combat or related emergency only. Since it was 1936 there was no war yet. But the plot still has a hole: Kriegsmarine at this time had literally 2-5 U-boats (depending on precise date, two were available since Feb'36, third in Jun'36, fourth in Jul'36 and so on)... Highly unlikely there would be one detached for such esoteric mission... – AcePL Jan 9 '18 at 9:47

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