from the depths of the catacombs that lead to agartha. you see every few hundred thousand years the tectonic plates of the earth begin to move sporradicly again as a magnetic pole flip occurs and during that time span the underground passages around the world open up.
nothing and i mean absolutely nothing can save you from the darkness that has been released from the 1930s onwards by the particle accelerators that now devour the earth and its inhabitants in the shadows of CP violation and antimatter as these catacombs connect that which had been firmly sealed away by the likes of osiris, kek, the amaleks or hitler.
hope that helps you to pintpoint the geographical location by latitude and longitude.