00:00The ultra-large container ship Emma Maersk is grinding toward the seabed right now.
00:05Why do massive cargo vessels need to cross shallow channels with barely any room to spare?
00:11Most people assume deep oceans protect giant ships,
00:15but underwater silt ridges trap heavy vessels instantly.
00:19Pilots use high-speed tidal surges and hull squat physics
00:23to slide massive steel hulls through inches of mud.
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