Those tourists who come to Lviv, Ukraine, are often offered to have an exersion to the city underground, but in fact they are always fake - for twenty hryvnias you come down to a basement of some house and listen to stories about some terrible tortures and executions. This time you can have a look at the real underground of Lviv - the biggest underground river in Ukraine - the Poltva. One more place we are going to visit - an abandoned bunker, former secret object "Loschina" ("Hollow").
It used to be a navigable river. The Poltva had a city-forming meaning when Lviv was being built, it served as a moat and protected the city from the northern side.
The riverbed was hidden underground in the central part of the city in the middle of the nineteenth century - allegedly because Lviv was threatened by malaria. That is why the Poltva turned into sewage soon. In 1870 the length of the system was fifteen kilometres, in 1903 - 54 km, 1910 - 82 km, 1939 - over 150 km.
On the ceiling are roots of trees.
Interesting enough that the system was being built by the Austrians.