> How would you make a system which could kill interlopers quickly and reliably 10,000 years from now?
1. Put the real stash of waste very, very deep underground.
2. Put a (much smaller) booby stash in a moderately innaccesible place above. People who make it this far should get the first symptoms within one hour and probably die painfully a few weeks later.
3. Leave smaller traces of the stuff laying around in the more accessible areas of the site. Ideally, it should not leak out and should not be easily removable by human means. However, the main goal is to have people getting sick by repeated exposure. Nothing that kills right away, but something that leads to reduced life span and/or quality of life.
> Also, killing people is a great way to send the message that "something valuable is here."
The point is not to issue any overt warning. People will be smart enough to create a story that fits the scenario. Instead of a fortress made to guard unfathomable riches with ancient evils, you want them to think of us like a bunch of idiots that messed with stuff they did not quite grasp and got Darwinized in the process. There will always be 3Ds jobs: dumb, dirty and dangerous. You masquarade as one of such places and people will not give it a second thought.
