They had organised an underground version of the university which was strongly opposed by the Nazi authorities. Borsuk, for example, was imprisoned after the authorities found that he was helping to run the underground university.
Sila had organised ng isang lihim na bersyon ng ang unibersidad na kung saan ay Matindi ang laban sa pamamagitan ng mga awtoridad ang Nasi. Borsuk, halimbawa, ay makulong pagkatapos ng mga awtoridad na natagpuan na siya ay tumutulong upang tumakbo sa ilalim ng lupa unibersidad.