Picture of the day. (44 Viewers)

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That sub looks like it was hammered together with tin
They were similar in construction to our S-Boats. Thin hulled, I believe their test depth was around 150 to 200 feet. Of course they far exceeded those depths in years to come! If I recall correctly they still have the deepest diving military subs in the world not counting scientific and exploratory vessels.
 

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