External manifestations
destruction of underground infrastructure

Sometimes the manifestations of these underground problems are very large and terrible. Because of the imperfection of the underground pipes, tons of soil are carried along them, a subterranean cavity is imperceptibly formed and grows, until the outer coating collapses and the cavity opens.
Under the ground, houses, roads and cars leave.
Streams rushing through the pipes burst into the surface due to the sudden collapse of the pipe below the flow.
Underground collectors cease to cope with the drainage of water during the rain.
All nations of the world are subject to these disasters. On the photographs of the accident on the roads of the USA, Great Britain, Poland, Estonia, Ukraine, Russia, China.