What is the Boring Company building between Austin and San Antonio?

“Boring Company is working on a simple, precursor Hyperloop tunnel between Austin and San Antonio (>200 mph). Due to traffic congestion, that journey can currently take up to 2.5 hours. @BoringCompany can reduce that to a consistent <30 mins.”

— Elon Musk, 20 September 2026 · Post on X ↗