The Boring Company is now running TWO Prufrock tunnel boring machines simultaneously beneath Nashville, and the engineering happening underground is insane Prufrock-MB1 and Prufrock-MB2 are actively mining through extremely strong Nashville limestone Core samples collected throughout tunneling have consistently tested at around 14,000 psi compressive strength And removing all that rock is an engineering system by itself As each Prufrock cuts through the limestone, excavated rock is continuously carried away from the boring machine through a conveyor system running through the tunnel The material reaches the launch site, then moves through the vertical cassette and vertically stacked conveyor belts before dropping into the rock pit at the surface So while the machine keeps advancing underground, there is an entire continuous system behind it moving excavated limestone out of the tunnel Two machines Two parallel tunnels Two continuous rock-removal systems All operating simultaneously And this is only scaling from here Prufrock-MB1 has been continuously upgraded as it tunnels, with TBC reporting consistent week-over-week performance improvements Lessons learned from MB1 were incorporated into MB2 Now Prufrock-MB3 is scheduled to arrive in Nashville this month, incorporating what TBC has learned from both machines to make it significantly more efficient from day one This is how The Boring Company is scaling tunneling: More machines digging in parallel Continuous excavation and rock removal Rapid hardware iteration Improvements carried directly into the next machine Higher production rates with every generation And all of this is being built for Nashville’s Music City Loop The system will connect downtown Nashville and Music City Center with Nashville International Airport, with the airport-to-downtown journey taking roughly 9 minutes More than 40 stations are already in various stages of planning and design TBC also has authorization for up to 25 miles of tunnel within TDOT right-of-way And the entire system is privately funded.....zero taxpayer dollars for construction or operation Elon’s vision with The Boring Company goes far beyond digging a single tunnel The goal is to take transportation 3D for cities built in 3D So...bigger idea is to make tunneling something that can scale: deploy more machines, dig simultaneously, iterate constantly, increase speed, drive costs down and eventually build enormous underground transportation networks beneath cities Nashville is starting to show what that looks like