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Nine of the prominent German scientists who published reports in ''Kernphysikalische Forschungsberichte'' as members of the ''Uranverein''{{sfn|Walker|1993|loc=pp. 268–74 and Reference n. 40 on p. 262}} were picked up by [[Operation Alsos]] and incarcerated in England at Farm Hall in a bugged house under [[Operation Epsilon]]: [[Erich Bagge]], [[Kurt Diebner]], [[Walther Gerlach]], [[Otto Hahn]], [[Paul Harteck]], [[Werner Heisenberg]], [[Horst Korsching]], [[Carl Friedrich von Weizsäcker]], and [[Karl Wirtz]]. Also incarcerated was [[Max von Laue]], although he had nothing to do with the nuclear weapon project. [[Samuel Goudsmit|Goudsmit]], the chief scientific advisor to Operation Alsos, thought von Laue might be beneficial to the postwar rebuilding of Germany and would benefit from the high level contacts he would have in England.{{sfn|Bernstein|2001|pp=50, 363–65}}
In 1992 the transcripts were declassified. Several physicists have analyzed the transcripts, particularly the section immediately after the German scientists were informed about the Hiroshima bombing. In the transcript, Heisenberg acts with disbelief, and argues that it would require "about a ton" of enriched uranium to make such a bomb. In justifying his reasoning, he gives a brief explanation of how one would calculate the critical mass for an atomic bomb which contained serious errors. Two scientists on the Manhattan Project, [[Edward Teller]] and [[Hans Bethe]], concluded after reading the transcripts that Heisenberg had never done the calculation before. Heisenberg himself, in the transcript, said that, "quite honestly I have never worked it [the critical mass calculation for an atomic
====Oranienburg plant====
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