panels will be placed on the existing construction. The construction is scheduled to start in 2019 and to finish in 2020. Lagums One of the characteristics of the Zemun's topography are the lagums, artificial underground corridors which crisscross below the loess area of Gardoš, Muhar, Ćukovac and Kalvarija. This terrain is one of the most active landslide areas in Belgrade. Being cut into for centuries, the loess in some sections have cliffs vertical up to 90%. The Romans began digging the lagums at least as early as 1,700 years ago, using them mostly as the food storages, but later were also used for supply and eventual hiding and evacuation. In the previous centuries, settlers left many vertical shafts which ventilated the lagums, drying the loess and keeping it compact. The loess is useful for this: it is strong, durable, and easy to be dug through. However, it turns into sand when mixed with water. The average temperature in the lagums is Though used by the local population as food storages, during the Ottoman period, the Turkish administration did not commonly use them. After the Austrians acquired Zemun, they used the underground to store ammunition. In this period, the myths of the entire grid of underground corridors connecting Zemun and Belgrade under the Sava river originated. However, historians dispute this as, though the Austrians held Zemun permanently from 1717, they held Belgrade only from 1717 to 1739, which was not enough for such a major engineering enterprise, given the technology of the period. On 31 July 1938, a section of the Zemun's Roman Catholic cemetery collapsed and fell through into the lagum on which it was built, one of the largest in Zemun. As of this time people tended to label any old structures as "Roman", believing that the Romans had built them, they referred to the corridors as the "Roman" ones. After World War II, as the city rapidly urbanized, the new settlers were unaware of the lagums, especially the largest one, which covered an area of on Ćukovac. As there was no sufficient sewage system at that time, they built septic tanks and collected rainwater, but also as the ventilation shafts in time were covered or filled with garbage, it all made the ground wet in the course of several decades. The lagums retained the moist and began to collapse. Eventually, the walls and houses became unstable to the