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	How the world's longest underwater tunnel was built - Alex Gendler (TED-Ed) View
	How the world longest underwater tunnel was built (The Perspective) View
	Undersea Rail Tunnel Between Japanese Islands: Seikan Tunnel Explained (Railways Explained) View
	Unbelievable! The sea is full of water, how is the undersea tunnel built (Machine Eye) View
	INCREDIBLE SWITZERLAND BIGGEST TUNNEL BORING MACHINE DIAMETER-HOW DOES TUNNEL BORING MACHINE WORK (Science \u0026 Technology UI) View
	China Leaves American President Shocked, Builds The Longest Undersea Tunnel In The World (Machine Eye) View
	HOW IT'S MADE: Underwater Tunnels (How It's Made) View
	Gotthard Base Tunnel: The World's Longest Railway Tunnel (Megaprojects) View
	Inside the $325 Million World's First and LARGEST Full-Scale Ship Tunnel (Nauctis) View
	How the world's first metro system was built - Christian Wolmar (TED-Ed) View