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"You'd shoot a little projectile from the drone that embeds itself in the cliff wall, and then you'd reel it back in with a sample."

Is that what would happen? How does the embed de-embed itself? How does the reeling in not end up pulling the drone closer to the cliff?

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I asked Bob about this. There are a bunch of options, but one way to do it is that you use a hollow projectile that takes a core sample, and then you just reel back in the core while the rest of the projectile stays in place.

Wow! Never did I expect that kind of response when I asked a random question on an internet forum. Thanks for the follow up!

mainly, precise tolerance engineering.

ofc we don't already know the exact composition and hardness of said cliff walls, so your question stands.

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