Elon Musk's tunneling venture, The Boring Company, is reportedly negotiating a $4 billion funding round that would value the startup at $20 billion—a staggering leap from its 2022 valuation of $5.7 billion. The deal, however, remains unclosed with terms subject to change, according to The Wall Street Journal. Main Developments The company has already operationalized a network of tunnels beneath Las Vegas, where Tesla vehicles shuttle passengers between stations. Beyond Las Vegas, The Boring Company has announced plans for tunnel systems in Nashville and Dubai, and has pitched projects in Baltimore, Chicago, and Los Angeles. Workers in these tunnels have suffered serious injuries, and Nevada regulators last year cited the company for nearly 800 environmental regulation violations. These safety and compliance issues cast a shadow over the ambitious expansion plans. Read also: Kalshi escalates feud with Netflix over prediction market documentary trailer Background The Boring Company spun off from SpaceX in 2018, inheriting Musk's vision of reducing urban traffic congestion through underground transit. Its previous $5.7 billion valuation in 2022 reflected early promise, but the startup has since faced mounting operational challenges. SpaceX, meanwhile, recently executed the largest IPO in history, but its stock price has experienced a significant decline since then. This broader market context may influence investor appetite for Musk-linked ventures. Why It Matters A $20 billion valuation would position The Boring Company as a major player in urban infrastructure, but the juxtaposition of rapid growth with safety lapses and environmental fines raises questions about scalability. For cities weighing tunnel proposals, the company's track record in Nevada could become a deciding factor. What's Next The funding round remains in flux, with terms potentially shifting before closing. If successful, the capital would likely accelerate construction in Nashville and Dubai while supporting pitches to Baltimore, Chicago, and Los Angeles. Regulators in those cities will be watching Nevada's enforcement actions closely as they evaluate permit applications.