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Recently, we again came across a photograph of "U-2513", which proved that actually a US President has sailed once with a former Kriegsmarine UBoat (picture at www.navsource.com)
"U-2513" was part of the 30 from 156 still operational German UBoats that surrendered at the end of WW II to the Allies, which were distributed at equal shares among the Allies in accordance with the agreement by the "Tripar-tite Naval Commission (TNC)", that was established by the Potsdam Conference in August 1945. On 06th of Au-gust 1945 "U-2513" departed its intermediate port of internment, Lisahally at Northern Ireland, for the USA, where it reached the US Naval Base Portsmouth, N.H. on 05th of September 1945.
These Type XXI "Electroboats" with their superior technological parameters were of extreme interest to the US Navy and "U-2513" was recommissioned and operated by a US crew as "EX U-2513". During her comprehensive test and trial journeys "U-2513" was dislocated to Key West, Florida in September 1946. On 26th of November 1946 US President Harry S. Truman visited the UBoat and took part in a several hour long demonstration tour. He actually submerged with the UBoat down to 70 mtr to experience its underwater operational capabilities, including the high underwater speed and steering devices, which were installed as part of early tests for the new US nuclear submarines under development.
Allegedly, the President witnessed even "Black Light" conditions, when the entire power supply for the UBoats was cut off for a moment due to the overload status of the battery propulsion while in high underwater speed modus. "U-2513" continued tests and trials until July 1949, when it was decommissioned . Following a period of being layed-up, the UBoat was used as target demonstrator and on 07th of October 1951 sunk by the "Hedgehog"- ASW bomblets of destroyer USS "Robert A. Owens" off Key West.
During his research our British friend Derek Waller has spotted a second visit of "U-2513" by the US President. On 05th of December 1947, the President came on board another time and rewarded the Commanding Officer and other officers of that Type XXI Uboat being taken over by the US Navy in 1945 for tests and trials for the underwater operation he was privileged to participate in a year before.