In the interest of security, the allied cryptological services, before sending their messages over a teleprinter line, encrypted them using "Enigma doubles". Henri Braquenié often closed messages with a ""Heil Hitler!"" As late as December 1939, when Lt. Col. Gwido Langer, accompanied by Captain Braquenié, visited London and Bletchley Park, the British asked that the Polish cryptologists be turned over to them. Langer, however, took the position that the Polish team must remain where the Polish Armed Forces were being formedon French soil. The mathematicians might actually have reached Britain much earlierand much more comfortablythan they eventually did; but in September 1939, when they went to the British embassy in Bucharest, Romania, they were brushed off by a preoccupied British diplomat.