— Elon Musk (@elonmusk) December 10, 2024 Such a figure would be cheaper than the cost of the world's current longest underwater tunnel, the 31-mile Channel Tunnel linking London and Paris, which cost £9 billion in 1984, approximately £18 billion in today’s money. According to Forbes, the idea of a tunnel running between London and New York was first conceived by American researchers at MIT Ernst Frankel and Frank Davidson, who proposed a maglev vacuum train line that would cross the 3,500-mile distance between the metropolises and allow for speeds of up to 1,200 miles per hour. If built, the tunnel would be one hundred times longer than the Channel Tunnel, revolutionising trade and relations between the two countries. Musk has previously discussed his desire to build “supersonic” lines called hyperloops. In 2013, he proposed building a line between the California cities of Los Angeles and San Francisco that would carry small carriages at 700 miles per hour. Since then, other firms have tried to build similar loops with varying degrees of success, including British billionaire Richard Branson, whose transportation company Virgin Hyperloop travelled 500 meters in a BIG-designed pod and reached speeds of 100 miles per hour in 2020. SUBSCRIBE