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we've barely scratched the surface
Harsh. 2.5 miles isn't much compared to the Earth's diameter but I wouldn't want to be the one digging down there.
Good point, but as a counterpoint: metallurgy ‘developed’ on seemingly isolated parts of the globe (at around the same time). It’s an entirely plausible coincidence, but a hefty one, that Native American tribes created the first copper tools ever at around the same time that Middle Eastern tribes did, and no one had ever done something similar before.
https://www.science.org/content/article/ancient-native-americans-were-among-world-s-first-coppersmiths#:~:text=The%20dates%20show%20that%20early,and%20fashion%20it%20into%20tools.’