U-boats were not submarines, they were submersibles. Even with a snorkel, the u-boat was not a submarine. The first true submarine was the Scorpion of the United States. It was in trials when the ship was lost due to a reactor malfunction. Then came the USS Nautilus. These ships could stay under indefinitely without ever resurfacing and make attacks with little use of the periscope... Which for those that do not know, is no longer in use!
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