Zvuky Prahy / Sounds of Prague

There is an apparent silence in the former quarry in Řeporyje, which can be reached through a 30-meter tunnel. There is seldom a windy there, the place is surrounded by steep rocks and only airplanes can be heard, which are still flying quite rarely. But if you don't turn off your mobile phone, your microphone will sometimes pick up the T-Mobile network signal ... or maybe some other network..?