How do we know that underground testing has little consequences if all the sites are national security zones. What we do know is that the underground geology is

How do we know that underground testing has little consequences if all the sites are national security zones. What we do know is that the underground geology is likely permanently compromised, at least within any meaningful time frame, and all nearby aquifers and other water deposits are poisoned for all intents and purposes into the distant future. These tests are ecological horrors that are unnecessary and destructive.