point of breaking façades and walls. In 1988 city authorities finally intervened as the houses began to sink in three streets. Holes were drilled to connect the surface with the largest lagum. Altogether, 22 drillings were made and of concrete were poured into the lagum, filling it until the ground was stabilized, but the lagum was destroyed in the process. Still, the situation is critical after almost every downpour. On 29 September 2011, while constructing the supporting wall which was to prevent landslide in the section of Kalvarija, the construction workers triggered one which killed four of them. A long lagum, which was explored by 2001, is located right below the place where the tragedy happened. So far, 76 long corridors have been discovered, with many smaller ones. The longest of them is long and the total explored length is . They cover an area of . Many have collapsed during time, as they are not being kept since the 1980s. Still, it is believed that the majority of them haven't been discovered or explored. The walls of those which have, are being covered with bricks or woods. Some corridors are dead ends while others are connected. The "Galeb" rowing club uses one of the lagums on the bank of the Danube to store their kayaks. There are numerous stories about the Zemun's lagums, their distribution and expansion of the grid. The tales of lagums connecting Zemun with the bank of the Danube, neighboring Bežanija, the Roman well in the Belgrade Fortress and the other parts of Belgrade across the Sava, became a commonplace in Zemun's and Belgrade's urban mythology. Older myths even included various monsters dwelling below. Still, there is a historically confirmed story of the house of Živojin Vukojčić, Interbellum industrialist. His son, Dragi Vukojčić, built the underground rooms in 1943 as a shelter, but the local myths claimed that he had an entire factory below. Still, when the agents from the Communist security agency OZNA came to arrest him after the war, Vukojčić asked to let him change his clothes. He fled down the lagum to the Danube, and then via boat and a plane, escaped to Brazil. Latest stories include criminals from the Zemun Clan, who were allegedly hiding in the lagums during the police Operation Sabre, after they assassinated prime minister Zoran Đinđić on 12 March 2003. In the 21st century, the stories of mythical