00:00Two colossal steel walls fight raging North Sea tides right now to save millions.
00:06How do 680-ton bowling ball hinges survive millions of tons of water pressure without snapping?
00:13Engineers initially relied on rubber seals to block grit, but abrasive silt quickly compromised their integrity.
00:20A specialized grease pumped into the mass of joints protects the steel spheres as they pivot inside concrete sockets.
00:27This filthy metal friction keeps the entire coastline safe while two colossal steel walls fight.
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