📌 UPDATE — June 17, 2026
The Boring Company confirmed that Prufrock-MB2 has completed commissioning in Nashville and is now ready to begin active mining operations — joining MB1, which already had a significant head start underground. The company shared footage of MB2's commissioning, including an 11 rpm rotation test. In the same announcement, TBC revealed that Prufrock-MB3 is scheduled to ship in August 2026, signaling a rapid acceleration in machine deployment across its expanding tunnel network.
"Prufrock-MB2 is ready to mine in Nashville! MB2 commissioning is complete, including the brief 11 rpm rotation shown here. Will MB2 catch up to MB1, who had quite the head start? And Prufrock-MB3 ships in August!"
— @boringcompany, June 17, 2026
With MB2 now mining in Nashville and MB3 on deck, The Boring Company is on track to have three Prufrock machines in active or imminent deployment simultaneously — a first for the company.
The Boring Company is juggling three active tunneling operations simultaneously — and each one presents a completely different engineering challenge. In a post shared Friday, the company confirmed it is currently boring through clay and caliche in Las Vegas, limestone in Nashville, and sandy clay in Bastrop, Texas. It's a quiet but telling sign of how quickly the operation has scaled beyond its Las Vegas origins.
Las Vegas remains the furthest along. The Prufrock-2 tunnel boring machine completed a 2.28-mile tunnel in March 2026 — the longest single Vegas Loop drive to date — moving roughly 68,000 cubic yards of material in the process. The broader Vegas Loop now spans 11 stations and has carried over 4 million passengers, with Clark County and the City of Las Vegas having approved an eventual 68-mile, 104-station network. Nashville and Bastrop represent newer fronts, with the Bastrop site also functioning as a central R&D and operations hub for the company's Prufrock TBM program.
The geological variety matters more than it might seem. Clay, limestone, and sandy clay each behave differently under a boring machine — affecting wear rates, spoil removal, ground support requirements, and tunneling speed. The fact that the company's Prufrock machines are operating across all three simultaneously suggests the platform is maturing beyond a single-site proof of concept into something that can be deployed at scale in real-world conditions. Whether Nashville and Bastrop eventually mirror the Vegas Loop's passenger transit model — or serve different purposes — remains to be seen, but the multi-city footprint is no longer theoretical.
David covers the EV industry, regulatory developments, and accessory ecosystem. 15+ years writing about consumer tech. Based in London.
Sources verified at publish time. Spotted an inaccuracy? Email editorial@basenor.com.
