Elon Musk's Boring Company just raised $3 billion at a $23 billion valuation — private capital betting on underground transit while federal infrastructure projects burn taxpayer cash for decades with nothing to show.
The Series D round, led by the United Arab Emirates, values the tunneling startup at roughly four times what it was worth four years ago, when it raised $675 million at a $5.7 billion valuation, according to TechStartups.com. Sequoia Capital, Andreessen Horowitz, Vy Capital, Valor Equity Partners, Temasek, Shamal Holding, Baron Capital, and Human Capital joined the financing.
The UAE commitment extends well beyond cash. The Boring Company announced a deal to build more than 150 kilometers — about 93 miles — of underground infrastructure across the country, separate from the previously announced Dubai Loop project. That's a massive footprint for a company whose only operating system right now is roughly four miles of tunnel beneath the Las Vegas Convention Center, where Teslas shuttle passengers through what Business Insider described as the startup's main project.
Business Insider framed the raise as part of a broader "Musk Inc" frenzy — noting SpaceX's $86 billion public listing in June and Neuralink's secondary-market valuation hitting $42 billion. The outlet also emphasized The Boring Company's failures: plans for tunnels in Los Angeles, Washington, DC, and Chicago were "quietly shelved or canceled over the past decade."
What Business Insider buried: the engineering advances that make the UAE bet plausible. TechStartups.com reported that the company's Prufrock tunnel-boring machine has demonstrated "Zero-People-in-Tunnel" continuous mining as of May 2025, advancing and installing tunnel rings without workers inside the tunnel. By August 2026, the company says its system could autonomously assemble tunnel rings from six concrete segments weighing roughly 3,750 pounds each, positioned with millimeter-level precision in less than a minute, monitored remotely from Texas.
That matters because the old way of building tunnels — massive crews, years of delays, cost overruns — is exactly how government transit projects operate. California's High-Speed Rail has consumed over $20 billion in state and federal funds with no operating line to show for it. New York's Second Avenue Subway cost $4.6 billion per mile. The Boring Company is promising to bore without launch pits, without crews underground, and at a fraction of traditional costs.
The Vegas Loop is approved to expand to roughly 68 miles of tunnels. Nashville's Music City Loop has been greenlit. The company has already dug a "Cybertunnel" for completed Cybertruck units at Tesla's Texas gigafactory, per Business Insider.
The UAE deal puts all those engineering claims under real pressure. Building 93 miles of tunnel in the desert isn't a convention center demo. If The Boring Company delivers, it proves that private capital and American innovation can do what a thousand government planning commissions couldn't. If it doesn't, a lot of foreign money just bought a very expensive hole in the ground.
