[MathMonkeyMan]

I did undergrad in Physics at the University of Florida. Some (many?) labs there did condensed matter experiments involving Helium 3. It's a million times more rare than normal helium. Nonrenewable, all that.

There was a dedicated system underground. Vacuum jacketed tubes taking waste helium from the labs to a reservoir across campus.

Helium is rare, helium 3 is precious.