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Eavesdropping on Hitler’s Reich
tigated and he was acquitted?’ “I suspected two persons of belonging
to the foreign Secret Service,” continued Professor Heisenberg.
“The first one is Dellenbach [sic. Dallenbach ], and I am pretty sure
about him; and the second one is Gehlen, but I am not sure about
him.”
Gerlach said he was “quite certain” as to Dellenbach. “You know
how he got his job?”
“I presume through his connections with [Martin] Bormann’s
cousin.
Gerlach said: “Then there was that unpleasant business about
Dellenbach and the Swiss telegram about the Uranmaschine which
our Secret Service intercepted, it all seemed to point to Dellenbach.
There were two other people mixed up in it, an engineer and a professor
– he (Dellenbach) wouldn’t tell me his name, but I heard
afterwards he was continually at (Hitler’s) headquarters. His name
was said to be Schmitt. He was one of those mysterious people and
Hitler made him a professor during the war. Later that S.D. man
[S.S.-Obergruppenführer Oswald] Pohl came to me and told me
the whole thing had been cleared up. . .”
In a further discussion that day on the “very odd” Bothe business,
Heisenberg concluded that Walther Bothe’s friendship with
the French communist Professor Joliot provided one clue. “It
doesn’t look as though Bothe will be joining us,” Diebner said to
Bagge elsewhere in Farm Hall that day. “It looks as though Gehlen
had the decency to keep Bothe informed,” responded Bagge.
These were the last conversations recorded at Farm Hall in the
pre-nuclear age.
ON AUGUST 6, 1945 an American aircraft dropped an atomic
bomb on Hiroshima. It consisted of a few pounds of almost pure
uranium-235, which had been separated from the more common
uranium-235 isotope by immensely costly processes combining
the use of centrifuges, diffusion, and tens of thousands of massspectrographs
in which the lighter 235 isotope was magnetically
Johannes Gehlen, who worked with Robert Döpel and Werner Heisenberg.