Known as block 13 until 1941, block 11 of Auschwitz I was the prison within the prison, reserved for inmates suspected of resistance activities. Cell 22 in block 11 was a windowless standing cell ("Stehbunker"). Split into four sections, each section measured less than and held four prisoners, who entered it through a hatch near the floor. There was a 5 cm x 5 cm vent for air, covered by a perforated sheet. Strzelecka writes that prisoners might have to spend several nights in cell 22; Wiesław Kielar spent four weeks in it for breaking a pipe. Several rooms in block 11 were deemed the "Polizei-Ersatz-Gefängnis Myslowitz in Auschwitz" (Auschwitz branch of the police station at Mysłowice). There were also "Sonderbehandlung" cases ("special treatment") for Poles and others regarded as dangerous to the Third Reich.