Dawid Gruber was 19 years old, in 1942, when he left his final message to the world. His testimony was placed in one of ten tin boxes and buried in the cellar of the Borochow School in the Polish city of Warsaw. He had no idea whether anyone would ever read it, but he hoped they would. Dawid was imprisoned behind the walls of the Warsaw Ghetto, unable to communicate with the outside world and he knew that his days were numbered.

The Warsaw Ghetto, where the Nazis forced up to 500,000 Jewish people to live, was established in 1940. By November 1941 it had been completely surrounded by walls and fences and cut off from the rest of society. Emmanuel Ringelblum, a Jewish Polish historian organised a large group of people to record the details of life and conditions behind ghetto walls. The group represented a wide spectrum of the imprisoned society and included academics, artists, teachers, journalists, religious believers, secretaries and young people like Dawid…

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