The tube now operates in a metro format, meaning that you can move along it from point A to point B. This includes logistics, supply of food, water, fuel for generators, supply of personnel." The Ukrainian army went more than ten kilometers underground along disused gas pipelines and reached the rear of the Russian army near Kupyansk. Now this pipeline is under the control of the armed forces of Ukraine and does not allow the Russian army to send attack groups in the opposite direction, to Kopiansk itself. The Ukrainian military talked to the Donbass project. A reality about how the underground operation of the National Guard took place, and what was achieved with its help.