| In May 1942, two Czechoslovak paratroopers sent to Prague by their government in exile in London carried out the assassination of Reinhard Heydrich, the Nazi overseer of Czechoslovakia. After the shooting, the paratroopers, along with several partisans who assisted in the plot, fled to the crypt of St. Cyril and Methodius Cathedral. Tragically, another partisan betrayed their whereabouts to the Germans, who first of all tried to shoot their way into the crypt, but when this did not work, pumped a large quantity of water in. On realising there was no escape, the resistance fighters committed suicide. The dramatic story is retold in a museum housed in the crypt of the church where the final events took place, entitled the National Memorial to the Heroes of the Heydrich Terror. Photos from the period and explanations recount a heroic, sad, and at the same time, frustrating story. The Heydrich assassination led to many innocent people, including almost the entire inhabitants of a village, Lidice, paying with their lives. The museum also tells the wider story of Czech people who resisted Nazi occupation during the war. | 
