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In page Vera Atkins:

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Atkins' first mission was to get Poland's cryptologists Marian Rejewski, Jerzy Różycki, and Henryk Zygalski out of the country. The trio were part of the Polish Cipher Bureau that broke Germany's Enigma ciphers from 1932 on, using Enigma-machine reconstructions[citation needed]. In July 1939, they had provided French and British cryptologists information on their decrypting techniques and the special-purpose equipment they had invented. Atkins was a member of the British military mission (MM-4), alongside Colin Gubbins, which arrived in Poland posing as civilians, by way of Greece and Romania, six days before the outbreak of the Second World War. [1][2]