The Polish Underground State was a secret government established during World War II in occupied Poland. It operated from 1939 to 1945, providing a structure for resistance against the German and Soviet occupations. This underground organization coordinated various activities, including military operations, education, and social services, while maintaining communication with the Polish government-in-exile. The Underground State was characterized by its commitment to Polish sovereignty and national identity. It included various groups, such as the Home Army (Armia Krajowa), which played a crucial role in the Warsaw Uprising of 1944. The efforts of the Underground State helped preserve Polish culture and resistance during a time of oppression.