Source: The Boring Company - April 1, 2026 project update confirming late-February start
Nashville Is Officially Tunneling
The Music City Loop has moved underground. Following final execution of the state tunnel permit and lease agreement, The Boring Company began tunneling in late February from Lot 16 near the Tennessee State Capitol.
The moment marks a clear before-and-after point for the project. Nashville has seen months of drilling rigs, excavation, equipment deliveries and launch-site construction. Now Prufrock-MB1 is cutting the permanent tunnel itself through the limestone beneath the city.
A Slow Start by Design
The first few weeks of a tunnel boring operation are not expected to look like full-speed production. The Boring Company describes the first four weeks as a launch phase, during which the machine is tested and calibrated underground while crews connect the trailing support gantries that follow behind it.
That means early progress is intentionally slower. Rock-removal systems have to be established, the machine’s steering and operating settings have to be tuned to Nashville’s geology, and the supporting equipment that installs and services the tunnel must be brought online in sequence.
How Prufrock Builds the Tunnel
At the front of the machine, a rotating cutterhead breaks the rock. Excavated material is moved away from the tunnel face and ultimately returned to the surface through a conveyor system. Behind the cutterhead, the machine’s support equipment provides power, ventilation and other services while the finished tunnel structure is installed and extended.
The result is very different from a traditional cut-and-cover project. Instead of opening a long trench through streets above, the boring machine advances below ground while most surface activity remains concentrated at launch, retrieval and station sites.
Why the First Bore Matters
The first tunnel is also a real-world test of months of assumptions. Engineers have already studied core samples and underground conditions, but operating a full-size machine through the rock provides much more detailed information about cutting performance, wear, water conditions and the pace at which spoil can be removed.
Those lessons will matter beyond MB1. A second Prufrock is being prepared for Nashville, and the company has said it will apply what it learns from the first machine to improve later launches.
The Project Enters Its Most Visible Phase
For most Nashvillians, much of the Music City Loop will remain invisible even as construction accelerates. But the start of tunneling is the strongest evidence yet that the system is moving from engineering drawings to built infrastructure.
Every day Prufrock advances now adds another section to Nashville’s first Loop tunnel. The next milestones will be measured by machine performance, the arrival of additional TBMs, station agreements and the eventual connection of the underground network to the places riders are meant to go.
Disclaimer
LOOP Nashville aggregates publicly available news, commentary, and editorial content related to the Music City LOOP project. All source material is fully credited and attributed to its original publishers. All commentary and editorial opinions are solely those of the LOOP Nashville Editorial Staff. We are an independent site and are not affiliated with The Boring Company or the Music City LOOP project.