The tech is way older than Musk. In the 80s it was called Evacuated Tube Transport or ETT. It had feasibility problems then and it does now. It's a nice idea, but we're a long way from the tunneling technology and vehicle technology to make it a reality.
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[ 0.24 ms ] story [ 25.2 ms ] thread[1] https://en.wikipedia.org/wiki/George_Medhurst