The Boring Company is gearing up to tackle one of its toughest projects yet, a new tunnel system beneath Nashville’s notoriously tough limestone terrain. Unlike the soft-soil conditions of Las Vegas and Austin, the Music City Loop will require a “hard-rock” boring machine capable of drilling through dense, erosion-resistant bedrock. 

The Boring Company’s machine for the project is now in final testing.

A boring hard-rock tunneling machine

The Boring Company revealed on X that its new hard-rock TBM can generate up to 4 million pounds of grip force and 1.5 million pounds of maximum thrust load. It also features a 15-filter dust removal system designed to keep operations clean and efficient during excavation even in places where hard rock is present.

Previous Boring Co. projects, including its Loop tunnels in Las Vegas, Austin, and Bastrop, were dug primarily through soft soils. Nashville’s geology, however, poses a different challenge. Boring Company CEO and President Steve Davis mentioned this challenge during the project’s announcement in late July.

“It’s a tough place to tunnel, Nashville. If we were optimizing for the easiest places to tunnel, it would not be here. You have extremely hard rock, like way harder than it should be. It’s an engineering problem that’s fairly easy and straightforward to solve,” Davis said.

Nashville’s limestone terrain

Experts have stated that the city’s subsurface conditions make it one of the more complex tunneling environments in the U.S. The Outer Nashville Basin is composed of cherty Mississippian-age limestone, a strong yet soluble rock that can dissolve over time, creating underground voids and caves, as noted in a report from The Tennessean.

Jakob Walter, the founder and principal engineer of Haushepherd, shared his thoughts on these challenges. “Limestone is generally a stable sedimentary bedrock material with strength parameters that are favorable for tunneling. Limestone is however fairly soluble when compared to other rack materials, and can dissolve over long periods of time when exposed to water. 

“Unexpected encounters with these features while tunneling can result in significant construction delays and potential instability of the excavation. In urban locations, structures at the ground surface should also be constantly monitored with robotic total stations or similar surveying equipment to identify any early signs of movement or distress,” he said.

Elon Musk recently revealed something quite shocking about the Optimus demonstration hand that was showcased at the 2025 Annual Shareholder Meeting. As per the CEO, the complex robotic hand that impressed the event’s attendees was not a component of Optimus V3 at all. 

Needless to say, it appears that Optimus’ V3 iteration is still very much under wraps. 

Optimus’s hand

Even in Tesla’s We, Robot event last year, the company showcased a robotic hand that seemed capable of performing complex tasks. A similar hand was showcased at the recent investor event. It was then no surprise that some attendees and EV community members assumed that the robotic component, which was very dexterous, was a preview of Optimus V3’s hand. 

As per Elon Musk in a recent post on X, however, this was not the case. While the robotic hand that Tesla showcased at the 2025 Annual Shareholder Meeting was already very impressive, it was still a V2 component. In response to a quote post from his mom Maye Musk, who noted that “Elon told me a few times that the hand is the most difficult part of the robot,” Elon Musk clarified that the impressive component was still from Optimus V2.

“This is just the V2 Optimus hand. The V3 hand is another level beyond this. Exquisite engineering,” Musk wrote in his post on X.

Not like Tesla

Tesla is designing Optimus to be a potential replacement for humans in some of the world’s most delicate tasks, such as surgery. It is then extremely important for Optimus’ hand to be very dexterous and refined in its movements. This is something that even companies that are also producing humanoid robots have yet to accomplish fully. Musk highlighted this during the Annual Shareholder Meeting, when he discussed how Tesla is really the only company that can scale humanoid robots properly.

“You will see certainly many companies showing demonstration robots. There’s really three things that are super difficult about robots. One is the engineering of the forearm and hand because the human hand is an incredible thing, actually. It’s super dexterous. 

“So, engineering the hand really well, the real-world AI, and then volume manufacturing. Those are generally the things that are missing. One or more of those things are missing from other companies. So Tesla is the only one that has all three of those,” Musk said.

Tesla CEO Elon Musk teased a potential job for the company’s Optimus robot last week that is straight out of the movie “Robocop.”

“Robocop” aimed to show a futuristic look at law enforcement in a Sci-fi thriller that was among the first iterations of how robots could be used for police work.

The 1987 film showcased an injured cop turning into an armed cyborg, and although Tesla’s Optimus won’t be a human-robot hybrid, Musk’s idea for the humanoid project is similar.

Musk said last week at the Annual Shareholder Meeting, where shareholders voted to approve his $1 trillion compensation plan, that Optimus could be the future of law enforcement, nearly revolutionizing the way criminals are prosecuted.

He hinted that Optimus could actually be used as a chaperone of sorts, arguing that it was a “more humane form of containment of future crime.” Musk said:

“If somebody’s committed a crime, we might be able to provide a more humane form of containment of future crime. You now get a free Optimus, and it’s just going to follow you around and stop you from doing crime. Other than that, you get to do anything; it’s just going to stop you from committing crime. That’s really it. You don’t have to put people in prisons and stuff. It’s pretty wild to think of all the possibilities, but I think it’s clearly the future.”

Elon Musk: With Optimus, we might be able to stop putting people in prison.

“If somebody’s committed a crime, we might be able to provide a more humane form of containment of future crime. You now get a free Optimus, and it’s just going to follow you around and stop you from… pic.twitter.com/Y8E2ToyNkd

— ELON CLIPS (@ElonClipsX) November 10, 2025

Musk’s overall idea for Optimus is to change the way people are able to exist, from those law-abiding citizens to others who have their run-ins with the law. Instead, the Tesla CEO believes there could be a different way to handle everything, including punishment.

It was not the only thing that Musk indicated could be changed significantly by the presence of humanoid robots, as he also said a universal basic income could be established with the help of products like Optimus.