> I wonder if there has been any consideration of this or attempts at placing long-lived simple markings to guide? There's a project to design and place long-l

> I wonder if there has been any consideration of this or attempts at placing long-lived simple markings to guide? There's a project to design and place long-lived simple markings to tell people to stay away from nuclear waste storage sites, and... it's hard problem: https://www.forbes.com/sites/jamesconca/2015/04/17/talking-to-the-future-hey-theres-nuclear-waste-buried-here https://www.forbes.com/sites/jamesconca/2015/04/17/talking-t...