Running a wither tunnel bore low in the nether has the advantage that you can get more ancient debris, but the machine needs to be able to deal with gravel. In this video I add a system to the tunnel bore that should be able to deal with it.

Machine only works on easy difficulty because of the wither behaviour.
built in 1.18.1

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Outro: Reckless by Olivaw   / olivaw   Creative Commons — Attribution 3.0 Unported— CC BY 3.0 https://creativecommons.org/licenses/... Music provided by Music for Creators    • Reckless — Olivaw