It was a simple stroke of serendipity that led to the discovery in Mexico of the earliest underground ochre mine in the New World, which a new journal article describes as a vast prehistoric industrial complex as much as 12 millennia old, where Paleonindians prospected for the valuable red iron-rich
https://nationalpost.com/news/world/a-canadian-scuba-diver-in-mexico-accidentally-discovers-a-vast-prehistoric-industrial-complex
https://nationalpost.com/news/world/a-canadian-scuba-diver-in-mexico-accidentally-discovers-a-vast-prehistoric-industrial-complex