Tech billionaire Elon Musk has hinted at a groundbreaking innovation: a transatlantic underground tunnel connecting two major cities, London and New York. Discussions about the project, which could reduce travel time between the two cities to just 54 minutes, have been ongoing.

Musk has claimed that his company, The Boring Company, could build the tunnel for $20 billion. This concept, which has been in discussion for decades, involves constructing a vast tunnel beneath the Atlantic Ocean, spanning over 3,000 miles (4,800 kilometers).

While the project has traditionally been considered impractical due to its massive cost, technical difficulties, and engineering demands, Musk’s innovative approach and technological advancements have sparked renewed global interest in this groundbreaking infrastructure venture.

In a recent discussion, Musk stated that The Boring Company could complete the project for a fraction of previous cost estimates, which had once reached around $19.8 trillion. “We can rethink how we build and scale infrastructure,” Musk said, emphasizing the role of innovative tunneling techniques, automation, and cost-effective materials in driving down expenses.

At the core of Musk’s proposal is Hyperloop technology, a cutting-edge transportation system that uses vacuum-sealed tunnels and magnetic levitation (maglev) to propel pods at speeds exceeding 3,000 mph. This could significantly reduce travel time and transform intercontinental travel.

While Musk’s transatlantic tunnel vision has generated excitement, experts remain cautious about its feasibility due to significant challenges. These include overcoming technical obstacles like oceanic pressure, seismic risks, and harsh underwater conditions. The estimated $20 billion cost is seen as overly optimistic, with concerns about funding.

Additionally, Hyperloop technology, central to the project, is still experimental and untested on such a large scale. Environmental impact, including disruptions to marine ecosystems and construction-related carbon emissions, requires thorough assessment. Lastly, coordinating a project of this magnitude across governments and international agencies poses substantial regulatory hurdles.