$19 trillion tunnel could go from London to New York in 54 minutes

Imagine stepping on to a train in and arriving in New York just 54 minutes later.

Although that might sound like something straight from the pages of science fiction, this is exactly what a proposed Transatlantic Tunnel claims it could achieve.

This Elon Musk-backed concept could allow travellers to complete the 3,400-mile (5,470 km) journey in less time than many people's inner-city commute.

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