Impossible? Consider that it has existed since before we were all born. So yes its fact that they exist, operate and are under our feet.  youtuber Dutchsinse was taken down prior to these underground operations. He was the best ongoing 24/7 Seismic Observation public platform. When China Lake was taken out , they had to in order to continue. He is a patriot and complied. So when Utah, Idaho, Nevada, Washington and all the other very strange earth quakes and underground activity have been going on, its masked and under reported. This is Gigantic. See this link if your interested, this is Dark to Light. Underground to above ground. As above, so below. s atanists went underground. Military men like Michael Aquino and the remains of the Third Reich are down there with all the  human experiments.  https://www.youtube.com/embed/6SLDk7V1CPY  Jump to 15 minute mark, you will see the Dutchsinse 3-d Earthquake global map and here Naval Veteran Gene describe 35,927 Children saved.