 After the Operation Vistula was concluded in 1949, the camp continued to be used as a prison for Polish political prisoners.Between 1951 and 1956, it was turned into the "progressive prison" for adolescents under the age of 21, of which some 15,000 passed through it as inmates, interned in better conditions than the previous batches of prisoners; their forced labour was accompanied by indoctrination and education.The camp's final closure took place during the wave of general post-Stalinist reforms, following a prison revolt in 1955 (a riot sparked by an incident of an escaping prisoner being shot dead).