It was a spectacle! I was called by a security guard to talk to some "workers". Two men are looking for the breakdown of a 6kV cable, which turns out to pass underground from the end of the office, carefully under the accessory leading to the basement. But how do they "seek"!!! They have a wooden rod about 1.6m long, they put it on the asphalt, and the other end lean to the ear and listen. I even wondered at first what shamans were. High voltage discharges are supplied to the cable from the substation and micro-explosions are obtained at the site of the rupture. Here are the sounds of these micro-explosions and listen to... the stick... the 21st century...

The men are definitely nice, uniquely, the accuracy of determining the breakout of 20-30 cm, but I still sit in the space...