Elon Musk’s tunneling startup, The Boring Company, is in negotiations to secure a $4 billion funding round at a $20 billion valuation, according to a report by The Wall Street Journal. The deal remains unfinalized, and terms could still change.

Valuation jumps nearly fourfold in two years

The proposed $20 billion valuation would mark a sharp increase from the company’s $5.7 billion valuation in 2022. The Boring Company, which spun out of SpaceX in 2018, has focused on underground transportation systems designed to reduce urban congestion.

Its most prominent project to date is a network of tunnels beneath Las Vegas, where Tesla vehicles shuttle passengers between stations. The company has also announced plans for tunnel systems in Nashville and Dubai, with proposals pitched for Baltimore, Chicago, and Los Angeles.

Regulatory and safety concerns surface

Despite its ambitions, The Boring Company has faced scrutiny over safety and environmental compliance. Nevada regulators reported last year that the company violated environmental regulations nearly 800 times. Additionally, tunnel workers have reportedly suffered serious injuries during construction.

The startup’s regulatory challenges come as SpaceX, Musk’s aerospace company, recently completed the largest initial public offering (IPO) in history—though its stock price has since declined.

What’s next for The Boring Company?

The funding round, if completed, would provide capital for expansion but does not guarantee project approvals. Investors and regulators will likely monitor the company’s compliance and safety record as it pursues new tunnel networks in multiple cities.

No timeline has been provided for the closing of the deal, and further updates may emerge as negotiations progress.