Warsaw, 19 April 1943. The Ghetto Jews, having been organizing armed resistance in recent months, rose up and finally the Nazis managed to retreat. The next day the Germans reacted hard and just a month later the ghetto was declared totally destroyed when the Grand Synagogue on Tłomackie Street was burned.

Two and a half years earlier, with the ghetto, 360,000 Jews were introduced into it, ending with only 10,000-15,000 survivors. Those who didn't take Treblinka died in the same ghetto. But the memory of what happened there survived thanks to a very special initiative.

The Jewish historian Emanuel Ringelblum brought together scientists, writers, cartoonists, rabbis... and created a group called Oyneg Shabat (the joy of the day of rest) that picks up the story of the daily life of the ghetto and picks it up in a book at the end of the war. The members of the group came together to chronicle what was going on in reports, trials or drawings.

Thanks to Yacob Grojanowski they were also able to collect what was happening in the concentration camps, which, despite being deported to the Chelmno camp, managed to escape and wrote the barbarities there observed and experienced. Oyneg Sabath produced a detailed report which, through the Polish resistance, managed to send it to London for publication.

But as deportations, disease and hunger increased, the group members' hope was diminishing. Aware of the limited possibility of surviving the ghetto and, therefore, writing the book, they concealed all the documentation collected in ten tin boxes and three beds in marmicity.

When the uprising erupted 80 years ago, the Germans captured and killed almost all of their members, but Ringelblum managed to escape with his family. They remained hidden for almost two years. But when the war ended, they were discovered by Gestapo members. They murdered two families, the Ringelblum and the whole protective family. But they managed to meet the target of the group: at the moment all the cans that were not a milk tupine have been found.