New Plans Reveal The Boring Company's Downtown Nashville Tunnel Launch Shaft at 500 Lafayette Street

The Boring Company is planning another major tunnel construction site in downtown Nashville, this time on a prominent SoBro property at 500 Lafayette Street.

Newly filed engineering plans reveal a substantial excavation that will require the removal of nearly 7,500 cubic yards of material to prepare the property for tunnel boring operations.

The Nashville Business Journal first reported the proposed drilling location on October 20.

A LOOP Nashville review of the grading plans, earlier engineering drawings filed with the State of Tennessee, and the project's environmental impact assessment provides a closer look at the facility and its potential role in the Music City Loop's next phase of construction.

The records place the proposed launch site directly alongside the airport connector's two planned tunnels and offer new insight into The Boring Company's strategy for deploying multiple tunnel boring machines across Nashville.

A major excavation in SoBro

The project appears in Metro Nashville's permitting system under stormwater grading application SWGR T2026082449.

The application identifies The Boring Company as developer and describes the work simply as a "Grading permit for launch shaft."

The company's engineering plans cover property at 500 Lafayette Street, 509 Lea Avenue, and 601 Rep. John Lewis Way South, encompassing a downtown site between Lafayette Street and Lea Avenue.

The plans show a large rectangular excavation supported by temporary shoring, construction access from Lafayette Street, erosion-control measures, and equipment for managing groundwater during excavation. An existing building is also marked for demolition.

According to the engineering drawings, crews will remove approximately 7,476 cubic yards of material, equivalent to more than 200,000 cubic feet. The project will disturb approximately 0.23 acres.

The stormwater technical review was approved October 7. The overall grading permit remains pending, and The Boring Company has not announced a construction start date for the site.

Earlier state plans show two tunnels alongside the property

The location becomes more interesting when compared with engineering plans The Boring Company submitted to the State of Tennessee in February.

Those drawings outline the Music City Loop's planned airport connector, which will run from downtown Nashville along Lafayette Street and Murfreesboro Pike toward Nashville International Airport.

Sheet 12 of the original state plans identifies the properties at 500 Lafayette Street and 509 Lea Avenue. Immediately alongside them are two proposed tunnel alignments, designated Tunnel 1 and Tunnel 2.

Each tunnel is designed with an outside diameter of approximately 13.12 feet. The engineering profiles show the tunnels running roughly 50 to 70 feet beneath existing street level through this portion of the corridor.

The new excavation plans, meanwhile, show a shallower construction area on the adjoining property. TBC could use the site to launch machines into the airport connector's twin-tunnel alignment, although the detailed launch configuration has not yet been released.

TBC's environmental study anticipated five launch sites

The new downtown facility also fits into a broader construction strategy described in The Boring Company's environmental impact assessment.

Prepared by Davey Resource Group in 2025, the study revealed that TBC was already planning a much larger construction operation than the original launch site near the State Capitol.

At the time, the company reported that approximately five tunnel boring machine launch sites were in various stages of design.

The study identified Lot 16 at 637 Rosa L. Parks Boulevard, where tunneling operations began, and another planned launch location at 200 Jupiter Drive near the airport. It also described efforts to establish additional launch facilities along the proposed route.

Although Lafayette Street was not specifically named in the study, its emergence as another launch location fits the company's plans to expand tunneling operations across multiple construction sites.

A typical launch shaft measures approximately 100 feet long and 50 feet wide, extending about 20 feet below the top of bedrock, according to the assessment. Construction begins by removing soil above bedrock before excavation continues into the underlying rock.

Individual facilities vary depending on geology and construction needs. Additional engineering plans may reveal more about the Lafayette site's final machine layout.

Could Lafayette Street support two tunnel boring machines?

TBC has already demonstrated that capability at Lot 16. Both Prufrock-MB1 and Prufrock-MB2 launched from the original Nashville site, which was designed with electrical infrastructure, cooling systems, compressed air, and other equipment needed for simultaneous tunneling.

The company's October 1 construction update also described another launch facility being equipped with enough electrical capacity to support two tunnel boring machines.

The Lafayette Street property sits directly alongside the airport connector's two planned tunnels, making it a possible candidate for a shared launch operation.

The new plans don't identify specific machines or launch positions. TBC has not said whether one or two machines will operate from Lafayette Street.

Construction activity could bring changes to surrounding streets

The environmental assessment describes activity at launch facilities, including equipment staging, excavation, material handling and truck traffic.

At a typical launch site, the report estimates approximately two to three dump truck loads of excavated material per hour during active tunneling. That is a project-wide planning estimate, not a Lafayette-specific traffic forecast.

The study left traffic impacts from additional launch sites for later consideration. Construction schedules, truck routes and traffic-control arrangements will be worth watching as TBC prepares the property.

Four tunnel boring machines by year's end

The Lafayette Street plans arrive at a pivotal point in the Music City Loop construction schedule.

In its October 1 update, The Boring Company reported that MB1 and MB2 were tunneling simultaneously beneath Nashville. MB3 was preparing for a late-October launch, while MB4 remained under construction.

The company's goal is to have all four machines underground before the end of 2026.

Earlier this month, LOOP Nashville investigated permitting and property records pointing to Jupiter Drive near the airport as another potential launch location.

With the new Lafayette Street plans, a broader picture of TBC's construction strategy is beginning to emerge. Multiple construction locations could allow crews to work on different sections of the route at the same time.

Whether Lafayette Street will become home to MB3, MB4, or another machine has not been announced.

What comes next

The immediate next step for the Lafayette Street property is completion of the permitting process. The stormwater grading application has passed technical review and the submitted engineering drawings provide a detailed look at the planned excavation.

Additional plans could reveal the final launch configuration, how the machines will enter the tunnel alignment and whether the site will support one or multiple TBMs.

For downtown Nashville, the proposed launch shaft represents another expansion of The Boring Company's construction footprint. For the Music City Loop, it could become a new starting point for the tunnels connecting downtown to Nashville International Airport.