While still on the surface, download the free audioguide to your phone. Below the surface, where there is no signal, nothing will surprise you, and even on an individual tour you will learn everything you want to know about the reservoirs. Download the audioguides in English here:
You can listen in the Audio Guide app (Google Play↓, iOS ↓).
Please download the Audio Guide app including the guide in your chosen language before entering the water tanks, there is no internet connection underground. If you enable location tracking when you open the app, it will automatically direct you to the Yellow Hill Reservoirs Guide. Otherwise, you must choose from the menu. Choose your language, download it (size approximately 150 MB, 17 recordings in total) and enjoy the tour of the site at your own pace!
Czech 
English 
German 
Polish