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Originally Posted by Raptor1
U-2540 was scuttled, raised in 1957 (I think) and used as the research submarine Wilhelm Bauer, Never as a combat vessel (And was subsequently decomissioned in 1980 and turned into a museum in 1983 (With the originial WWII configuration))
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Research submarine... that was the term I was looking for when I wrote "testsubmarine".
The site claims it was decommissioned from official navy duty in 1968 but kept operating with a civil crew until 1982.
But you are right, it wasn't used as a combat vessel but this doesn't mean that it couldn't have handled the job. If a upgraded WWII fleetboat could do the job I don't see any reason why a upgraded type XXI shouldn't be up to it.