The youngest of the three Polish mathematicians who had worked together since 1929—Jerzy Różycki—died in the sinking of a French passenger ship on 9 January 1942, as he was returning to "Cadix" from a stint in Algeria. By summer 1942 work at "Cadix" was becoming dangerous, and plans for evacuation were drawn up. Vichy France was liable to be occupied by German troops, and "Cadix"'s radio transmissions were increasingly at risk of detection by the German "Funkabwehr", a unit tasked with locating enemy radio transmitters. Indeed, on 6 November a pickup truck equipped with a circular antenna arrived at the gate of the Château des Fouzes where the cryptologists were operating. The visitors, however, did not enter, and merely investigated nearby farms, badly frightening their occupants. Nonetheless, at Bertrand's suggestion French intelligence ordered the evacuation of "Cadix". The order was carried out on 9 November, the day after the Allied "Operation Torch" landings in North Africa. Three days later, on 12 November, the Germans occupied the chateau.