Prepare For Underground Nuclear Test All is nearly ready for Project Gnome, an underground nuclear test, a quarter of a mile deep near Carlsbad, New Mexico. This is a test to develop peaceful uses of the atom and there is no danger of air pollution. Sign: Entering Carlsbad Caverns National Park. Men in hard hats on mine elevator, lowered. Interior, workers, men riding carts. Man crawling out of hole in wall.