a free man. He died in Chile in May 1994. Reassembling destroyed files Reassembling the destroyed files has been relatively easy due to the amount of archives and the failure of shredding machines (in some cases, "shredding" meant tearing pages in two by hand, making the documents easily recoverable). In 1995, the BStU began reassembling the shredded documents; 13 years later, the three dozen archivists commissioned to the projects had reassembled only 327 bags. Computer-assisted data recovery is now being used to reassemble the remaining 16,000 bagsrepresenting approximately 45 million pages. It is estimated that the task may require 30 million dollars to complete. The CIA acquired some Stasi records during the looting of the Stasi's archives. Germany asked for their return and received some in April 2000. See also Rosenholz files. Museums There are a number of memorial sites and museums relating to the Stasi in former Stasi prisons and administration buildings. In addition, offices of the Stasi Records Agency in Berlin, Dresden, Erfurt, Frankfurt-an-der-Oder and Halle (Saale) all have permanent and changing exhibitions relating to the activities of the Stasi in their region. Berlin Stasi Museum (Berlin) - This is located at Ruschestraße 103, in "Haus 1" on the former Stasi headquarters compound. The office of Erich Mielke, the head of the Stasi, was in this building and it has been preserved along with a number of other rooms. The building was occupied by protesters on 15 January 1990. On 7 November 1990, a Research Centre and Memorial was opened, which now called the Stasi Museum. Berlin-Hohenschönhausen Memorial - A memorial to repression during both the Soviet occupation and GDR era in a former prison that was used by both regimes. The building was a Soviet prison from 1946, and from 1951 until 1989 it was a Stasi remand centre. It officially closed on 3 October 1990, the day of German reunification. The museum and memorial site opened in 1994. It is in Alt-Hohenschönhausen, in Lichtenberg in north-east Berlin. Erfurt Memorial and Education Centre Andreasstraße - a museum in Erfurt which is housed in a former Stasi remand prison. From 1952 until 1989, over 5000 political prisoners were held on remand and interrogated in the Andreasstrasse prison, which was one of 17 Stasi remand prisons in the GDR. On 4 December 1989, local citizens occupied the prison and the neighbouring Stasi district headquarters to stop the mass destruction