Can you build and pressurize an underground lab with liquid helium?

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Maximum7
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TL;DR Summary
Trying to figure out if you can build a lab deep underground despite the pressure
I was watching a YouTube video from the
channel RL Hugh. He speculated on building a laboratory 1000 miles deep in the Earths
interior. He calculated that a person would
experience 70 gigapascals of pressure and a
temperature of 2000 degrees Celsius. He
envisioned a lab built under a piston in a large tube and concluded the lab could be
pressurized with liquid helium. Would this be
possible? He couldn't explain how we'd survive the pressure; he handwaved it away for now with special pressure suits but could this lab be built if pressurized with liquid helium. He also suggested it would be constructed out of olivine since that is abundant in the center of the planet.

Also robots would probably build this
 

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