On October 26, 1942 the codebreakers found Berlin warning Auschwitz to stand by to receive two visitors from the Führer's Chancellery in Berlin - the agency supervising euthanasia and various other killing schemes - for a lengthy stay at the camp: they would be setting up an X-ray sterilisation operation, the radio signal said (this being the method chosen by the S.S. to keep the Jews from breeding). (GC&CS German Police Section intercept: Lolling, Amt D III, to Auschwitz, Oct 26, 1942 (PRO file HW.16/11).]
Winston Smith Ministry of Truth Archive
[Note: As this is taken from an archived site, some links and videos below may not be working.]
Addendum - by this Site:
British historian David Irving's site comments (German SS and Police Unit Radio Messages in British Archives):IN THE Public Record Office in London (PRO) are now housed the records of the former Police section at Bletchley Park, where British codebreakers had begun reading the German SS and police messages even before WWII.
The police section amassed thousands of intercepts of police units on the eastern front, police headquarters in Germany, and concentration camp commandants reporting to Berlin.
It is worth noting, as the late Professor Sir Frank Hinsley the official historian points out, that nowhere in these myriads of (top secret, enciphered) messages is there any reference to gas chambers or gassings. 'The returns from Auschwitz, the largest of the camps with 20,000 prisoners, mentioned illness as the main cause of death, but included references to shootings and hangings. There were no references in the decrypts to gassing.' [Hinsley et al., British Intelligence in the Second World War: Its Influence on Strategy and Operations, Cambridge, 1979 - 84, 3 vols., vol. ii, appendix, page 673.]