Read more closely. Early in the paper they discuss that strong warnings might go unheeded as the danger is far below ground. They then suggest that it might b

Read more closely. Early in the paper they discuss that strong warnings might go unheeded as the danger is far below ground. They then suggest that it might be most effective to actually contaminate the surface level of the site with low-levels of radioactive material so as to purposefully kill people that invade the site. They then suggest doing calculations to see whether the expected casualties over 10,000 years would be worth it. Icky but cold and calculated thinking about a cold topic.