On the bright sight, he also promised Saudi Arabia to build a Hyperloop, also for The Line city in Neom, that’s turning out to be a great way to syphon SA’s oil sales state fund.

But seriously, a Hyperloop would work best on Mars, where the pressure differential would be minimal, while a tube would keep the dust out. Elon’s master plan is still to build a Mars colony with indentured servants under threat of no air. On the way, he’s scamming whoever it takes, and getting any investment or benefit he can land.