I'm not sure that would be shoking enough to sacrifice all of them for to keep it quiet. I think if it's a biolab or human experimentation or whatever all the paper has already been burned for heating and cooking and all the hard drives in any computers were destroyed long ago
I don't think there is anything down there anymore. They have had a long time to destroy all the evidence.
If it's anything nuclear then they can't destroy the evidence.
I'm not sure that would be shoking enough to sacrifice all of them for to keep it quiet. I think if it's a biolab or human experimentation or whatever all the paper has already been burned for heating and cooking and all the hard drives in any computers were destroyed long ago