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How the Channel Tunnel Was Dug Beneath the Ocean Using 1980s Technology

The Channel Tunnel is one of the greatest engineering achievements in human history — but nobody talks about HOW it was actually built. In this video, we break down exactly how 11 custom-built tunnel boring machines dug 38 kilometres beneath the English Channel using 1980s technology, ring laser gyroscopes, and zero GPS. From the fractured French geology that nearly derailed the entire project, to workers getting the bends underground, to a cost overrun that doubled the budget to £9.5 billion — this is the full, unfiltered story of the most ambitious construction project of the 20th century. We cover the breakthrough moment in 1990 when English and French tunnellers met 40 metres below the seabed with a margin of error smaller than a wine bottle, the 1996 tunnel fire that changed global safety standards, and why the company that built it went bankrupt twice despite creating infrastructure that changed Europe forever. If you're into engineering history, megaproject failures, or just insane human achievement — this one is for you.