http://kawbtpskqu7rr3t6ecz4fyutpzq7jtblin3wv5vamneryu4nwenhkgyd.onion/mediawiki/index.php?title=Urba%C5%84ski,_Tadeusz&action=edit
In this unit, his collaborators were Zbigniew Kapuściński and Tadeusz Tucholski (later victims of the Katyn crime; moreover, the first of them taught him pilotage at the Warsaw Aeroclub in the 1930s).
During World War II he stayed in England, where he continued his research in the field of biologically active compounds and explosives.