The Machine That Built This Tunnel Is Still Down There

The Machine That Built This Tunnel Is Still Down There Beneath the English Channel, a six-story-tall boring machine dug a tunnel 45 meters below the seabed — then engineers buried it forever, because bringing it back out would've cost more than building a new one. In this video, we go inside the most difficult engineering projects on Earth: underwater tunnels. From the massive Tunnel Boring Machines (TBMs) that chew through solid rock, to the terrifying phenomenon of "running sand" that has trapped machines underground, to the immersed tube method used to sink entire concrete sections to the ocean floor — this is how humans build tunnels beneath the sea without them collapsing. You'll learn: 🔹 How Tunnel Boring Machines navigate with millimeter precision across 50 km 🔹 Why workers undergo diver-style decompression after every shift 🔹 How engineers freeze the ground with liquid nitrogen to stop a tunnel collapse 🔹 The insane cost and scale behind tunnels like the Channel Tunnel, Seikan Tunnel, and Hong Kong-Zhuhai-Macau Bridge If this blew your mind, let us know in the comments which tunnel we should cover next — and subscribe for more deep dives into the world's most extreme engineering. ⏱ Timestamps: 0:00 Introduction [Añade aquí tus propios timestamps una vez edites el video] #UnderwaterTunnels #Engineering #ChannelTunnel #TBM #Construction