A hypersonic underwater tunnel connecting the UK to the United States could see trains travelling at speeds of 3,000mph. But the dream of a trans-Atlantic train connecting London and New York ...

Replacing the Tobin Bridge between Boston and Chelsea with an underwater is not out of the question, a project manager says.

Controversial billionaire and entrepeneur, Elon Musk, wants to connect the two continents with a 4800 km tunnel and “change the map of the Earth”.