Can't drill into a red-hot high-pressure slurry. That's why the millimeter laser that forms it's own casing is being evaluated.
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Quaise
Quaise, Inc was founded in 2018 to develop a millimeter-wave drilling system for converting existing power stations to use superdeep geothermal energy. The system repurposes existing gyrotron technology to drill 20 kilometers beneath the surface, where temperatures exceed 400 °C. Wikipedia
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