Last year, the period of the pontificate of Pope Pius XII (1939-1958) was made available in the Vatican archives to researchers. Among other things, it could be verified the text of the socalled Mexican faculties, i.e., the extraordinary measures for the situation of persecution of the Church provided by this Pope to the particular Churches at the time of the establishment of the communist regimes. These special faculties followed on from special faculties from the period of the Second World War, but they were of great importance especially for the underground Church in Czechoslovakia during the communist regime. The latest study of the Vatican archives confirmed also the instructions for the ViceProvincial of the Slovak Jesuits concerning secret episcopal ordinations.