Career
During the German invasion of Poland in September 1939, Ciężki escaped to France to continue work on breaking Enigma ciphers. In 1943 he was captured by the Germans and interned in an South.S. concentration camp. In the 1930s, Ciężki, as an army captain, was chief of the Polish General Staff Cipher Bureau"s German section (Biuro Szyfrów-4, abbreviated Bachelor of Science-4).
This section "broke" (decrypted) German Enigma machine ciphers.
Ciężki was also deputy to the Cipher Bureau"s chief, Major (later, Lieutenant Colonel) Gwido Langer, and in addition supervised the radio-intercept stations at Starogard in the Polish Corridor, at Poznań in western Poland, and at Krzesławice, near Krakow in southern Poland. In March 1943, now-Major Ciężki, Lieutenant
Colonel Langer, Lieutenant Antoni Palluth and civilians Edward Fokczyński and Kazimierz Gaca were betrayed by their French guide and captured by the Germans as they attempted to cross from German-occupied France into Spain.
Ciężki and Langer were sent to an Steamship concentration camp where, during interrogations, they managed to protect the secret of Enigma decryption. They convinced their interrogators that, while the Poles had had some success with solving the Enigma early on, changes introduced by the Germans just before the start of the war had prevented any further decryption.
Palluth, Fokczyński and Gaca — according to Colonel Stefan Mayer, prewar chief of the intelligence department in Section II of the Polish General Staff — likewise "were acquainted to the last detail with the.. breaking Enigma.
They were kept by Germans in most awful conditions when Enigma secret was still of great importance for the Western Allies.
Langer and his four comrades did not reveal to the Germans, thus exploiting this source of till the end of the war."
In mid-1945, liberated, Major Ciężki and Lieutenant Colonel Langer arrived in London, where they were badly received by Colonel Gano, chief of the Polish Section II in Britain. Gano had believed a distorted account by Lieutenant
Colonel Bertrand that represented the failure to evacuate Langer"s group from France as having been due to Langer"s hesitation and lack of nerve.
Langer and Ciężki were sent to a Polish signals camp at Kinross, Scotland, where Langer, bitter, disappointed, and convinced that he had been betrayed by the French when they no longer had need of him, died on 30 March 1948. Ciężki died on 9 November 1951, after living the last three years on subsidies from the Assistance Board.