They had been arrested for participating in the conspiracy against Hitler, which had culminated in the assassination attempt of July 20, 1944. They spent the last weeks of their lives here, before being executed on April 9, 1945, at the Flossenbürg concentration camp.
In the 1990s, various youth groups engaged in excavations to find and uncover the remains of the detention cellar.
On May 25, 2014, the memorial was anonymously vandalized. Its immediate restoration was generously supported by donations from the International Bonhoeffer Society and the Protestant-Lutheran Church Parish of Weimar.