The Channel Tunnel: How Engineers Drilled an Impossible $15B Tunnel Under the Ocean

The Channel Tunnel: How Engineers Drilled an Impossible $15B Hole Under the Ocean Welcome to MegaBuild Files. Six tunnel boring machines are still buried under the English Channel right now. Sealed in chalk. Never coming back up. In 1988, eleven 1,500-ton machines started cutting from both sides at once — blind, through 37 kilometers of rock, aimed at each other within centimeters. The budget doubled. Ten workers never came back up. The alignment error after 37 kilometers underground was 358 millimeters — less than the width of a doorway. How do you drill a $15B tunnel under a living sea — and what happens to the machines that can never come back? The Channel Tunnel holds the world record for the longest underwater section of any tunnel — 37.9 kilometers, deeper than the Seikan Tunnel in Japan, built by six TBMs from Shakespeare Cliff and five from Sangatte. Subscribe to MegaBuild Files for every megaproject and engineering crisis that's quietly reshaping civilization. #ChannelTunnel #Eurotunnel #TunnelBoringMachine #TBM #UnderwaterTunnel #EnglishChannel #Engineering #Documentary #Construction ⚠️IMPORTANT⚠️ This video is an educational analysis of the Channel Tunnel's engineering and construction, based entirely on publicly available open-source information. All visuals and animations are 100% synthetic, AI-generated conceptual representations. No real archival footage was used. This video is purely informational and intended for educational purposes only.