Elon Musk still seems to have plans to build a Hyperloop, the advanced transportation technology meant to solve traffic jams. A Hyperloop is a vacuum tube system large enough for the transportation of people and cargo. What’s unique about the idea is that it offers a much higher speed than a train or subway while being incredibly efficient. By largely eliminating friction, a Hyperloop should be able to use more of its energy for movement than other transportation systems.

Elon Musk developed the idea for a Hyperloop in 2012, then open-sourced the idea since he was too busy to work on it. While the concept of vacuum-tube transportation isn’t new, Musk’s initial work and interest spurred a few companies to pick up the idea and invest money into making it a reality. Progress has been slow. Virgin Hyperloop made notable headway with several short-range tests with people before finally shifting focus to transporting cargo.

Related: Virgin Hyperloop: How It Works & First Passenger Test Explained

With the latest advances coming from The Boring Company, Musk’s tunneling venture, it seems the Hyperloop project might be renewed. In a recent Tweet, Musk says an attempt will be made to build a working Hyperloop ‘in coming years.’ Using a qualifier is rare for Musk, who more frequently makes statements about what ‘will’ happen rather than an ‘attempt’ at completing a project. Whether that’s a good or a bad sign for the Hyperloop is unclear. However, there did seem to be some enthusiasm shared for the Hyperloop, with Musk describing this method of transportation as the “fastest possible way of getting from one city center to another for distances less than ~2000 miles.”

Hyperloop Might Really Happen

Inside the Virgin Hyperloop experience

Musk also speculated that a Hyperloop would be immune to surface weather, to which commenters pointed to flooded subway systems as an obvious flaw in this statement. Despite the challenges inherent in tunneling, it’s a system that solves many problems in crowded cities, and they continue to be made. For example, The Boring Company has a working tunnel in Las Vegas that bypasses surface traffic. But, living up to its name, the end result of a lower-cost tunnel is not as exciting as Musk’s ludicrously fast electric cars or spaceships.

However, The Boring Company’s newest digging machine, Prufrock-3, could change that by plowing through dirt and rock at incredible speeds. Prufrock-3 is expected to be much faster than the current generation, which digs only one mile per week. With the potential for new tunnels to be advanced at up to seven miles each day, an underground Hyperloop could proceed at a nice pace, possibly making Elon Musk’s Boring Company exciting again.