Maybe it is a signal tube, except that it's pretty horizontal. I would expect a signal tube to be vertical, but I'm not proficient in all WWII sub euipment. The tube that I saw was next to and in front of the number 2 and 4 stern tubes sticking out of the port pressure hull. It sort of reminded me of a torpedo tube, but miniature. It wasn't perpendicular to the hull, but probably was angled at 30 degrees horiziontal and maybe 15 degrees vertical (down).
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