Elon Musk said via Twitter on Sunday that urban transit tunnel company The Boring Company would seek to build a high-speed, and still theoretical, hyperloop within the next few years.

In 2013, Musk published a white paper outlining the idea of ​​a transportation system capable of sending passengers and cargo in capsules via low-pressure tubes at an access speed of 700 miles per hour. He never accepted the project. Instead, Musk shared a basic engineering plan and encouraged others to develop the concept. While various companies and researchers have been working steadily on hyperloop for nearly a decade, there are still no examples of such a working system in the world.

Musk founded The Boring Company in December 2016 on the premise that finding a fast and efficient way to dig a network of tunnels for high-speed vehicles and trains would end traffic jams. Boring’s company has secured several contracts with cities, but does not use hyperloop or high-speed transport. His most mature project in Las Vegas uses Tesla vehicles to transport people along a 1.7-mile underground tunnel at the Las Vegas Convention Center. Last year, the company received pre-approval for a special use license and franchise agreement that would allow Boring business to grow its Vegas Loop system to a 29-mile route with 51 stations that includes stops at casinos along the Las Vegas Strip, the city’s football stadium, and UNLV. Will eventually arrive at McCarran International Airport.

Musk’s tweet on Sunday, in which he responded to another tweet listing the world’s worst-trafficked cities, comes less than a week after The Boring Company raised $675 million in a Series C funding round that raised its valuation to $5.7 billion.

Cities with the worst traffic in the world:

1. London
2. Paris
3. Brussels
4. Moscow
5. New York
6. Chicago
7. Rome
8. Bogotá
9. Palermo
10. Istanbul

— World Statistics (@stats_feed) 24 April 2022

In the next few years, Boring Co will try to build a working Hyperloop.

From a known physical point of view, this is the fastest way to get from one city center to another for a distance of less than ~2000 miles. Starships are faster for long journeys.

—Elon Musk (@elonmusk) 24 April 2022

He also stated that Hyperloop, like other underground tunnels, would also be immune to surface weather conditions such as hurricanes. However, there is well-documented subterranean evidence, which lies in waterlogged underground tunnels. For example, the New York City subway was flooded in 2012 when Hurricane Sandy hit the coast. Since then, the Metropolitan Transportation Authority has valve installed at 68 Trans-Hudson Lower and Port Authority subway stations) in Lower Manhattan.

Underground tunnels are insensitive to surface weather conditions (underground is a good example), so Hyperloop won’t care if a storm hits the surface. You won’t even notice.

—Elon Musk (@elonmusk) 24 April 2022