London, Moscow, New York or somewhere else?
http://articles.latimes.com/1997-06-..._1_atomic-bomb
LOS ALAMOS, N.M. — When a captured Nazi U-boat arrived at Portsmouth, N.H., toward the end of World War II, the American public was never told the significance of what was on board.
The German submarine was carrying 1,200 pounds of uranium oxide, ingredients for an atomic bomb, bound for Japan. Two Japanese officers on board were allowed to commit suicide.
Two months later, in the New Mexico desert, the United States detonated the first atomic bomb, a prelude to the obliteration of two Japanese cities.
Unknown to many of the people who built those bombs, not to mention the public, Japan was scrambling to build its own nuclear weapon.
Some of the evidence was the uranium aboard the U-boat that surrendered in the North Atlantic on May 19, 1945, shortly after Adolf Hitler committed suicide on April 30.
Documents now declassified, including the sub's manifest, show there were 560 kilograms of uranium oxide in 10 cases destined for the Japanese army and two Japanese officers were aboard, accompanying the cargo.
"Germany was collapsing. They had a lot of good uranium. Somebody got this crazy idea of taking it to Japan," says physicist Herbert York, director emeritus of the University of California's Institute on Global Conflict and Cooperation.
"The Japanese officers insisted on being given the right to commit suicide."
German television, Zeit-TV, has aired interviews with crewmen recalling the Japanese officers who killed themselves and were buried at sea.
The uranium oxide is believed to have gone to Oak Ridge, Tenn., bolstering supplies for the Manhattan Project, the U.S. bomb program.
It was even possible--but not probable--that some of the uranium headed for Japan reached there aboard the Enola Gay, the B-29 that dropped the atomic bomb on Hiroshima on Aug. 6, 1945, says U.S. Energy Department archivist Skip Gosling. But the bomb dropped on Nagasaki on Aug. 9 used plutonium, not uranium.
https://en.wikipedia.org/wiki/German_submarine_U-234
The cargo to be carried was determined by a special commission, the Marine Sonderdienst Ausland, established towards the end of 1944, at which time the submarine's officers were informed that they were to make a special voyage to Japan. When loading was completed, the submarine's officers estimated that they were carrying 240 tons of cargo plus sufficient diesel fuel and provisions for a six- to nine-month voyage.[3]
The cargo included technical drawings, examples of the newest electric torpedoes, one crated Me 262 jet aircraft, a Henschel Hs 293 glide bomb and what was later listed on the US Unloading Manifest as 550 kg (1,210 lb) of uranium oxide. In the 1997 book Hirschfeld, Wolfgang Hirschfeld reported that he saw about 50 lead cubes with 23 centimetres (9.1 in) sides, and "U-235" painted on each, loaded into the boat's cylindrical mine shafts. According to cable messages sent from the dockyard, these containers held "U-powder".[4][5]
When the cargo was loaded, U-234 carried out additional trials near Kiel, then returned to the northern German city where her passengers came aboard.https://en.wikipedia.org/wiki/German_submarine_U-234