We could just leave a pile of skeletons at the entrance. Less facetiously: it's already been an area of study for some time: http://www.salon.com/2002/05/10/yuc

We could just leave a pile of skeletons at the entrance. Less facetiously: it's already been an area of study for some time: http://www.salon.com/2002/05/10/yucca_mountain/ http://www.salon.com/2002/05/10/yucca_mountain/