The Progeo Gmbh geomembrane consists of 2 layers of electrically conductive carbon fibre located on both sides of the primary waterproofing layer. During diagnostics, a 10000 V (0.02 A) current is directed to both layers, and in the case that there is damage, an electrical connection is made (through air leaking into the damaged area). The diagnostics device logs the information and announces the status (watertight/not watertight). Next, the thermographic camera is used to locate the area with the highest temperature (which is the damaged area) and the damage is fixed.

The diagnostics are performed at every step of the works – after installation of the membrane, after reinforcement of the second concrete ring and after the placing of concrete.