00:00The massive Heron Connect tunnel boring machine crushes through unstable seabed silt every single second.
00:08Millions of tons of heavy ocean water press down, threatening to instantly flood the underground chamber.
00:14Common sense says solid steel walls block the collapse, but actual steel plates would instantly fold under that immense weight.
00:22Instead, pressurized dirt slurry pushes back inside the chamber, balancing the exact weight of the ocean above.
00:31This exact liquid barrier holds back the entire seabed while the massive Heron Connect tunnel boring machine crushes through.
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