Comments by "Sar Jim" (@sarjim4381) on "The Last U-Boat Attacks of WW2" video.

There were two more electroboats on patrol at the surrender, the larger and more potent Type XXI versions. The U-2511 made a practice attack run on a British cruiser on May 4, according to the skipper, right after the surrender message was received. He stated he was never detected and could have easily torpedoed the vessel and escaped. It was lucky for the Allies that Germany didn't realize their plight until too late to get more boats into service.
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