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	Discovering the Longest Railway Tunnel on Earth! (Super Structures) View
	Switzerland Built the World's Longest Tunnel (Looking 4 ) View
	How Switzerland Built the Longest Railway Tunnel (MegaStructs) View
	How the world longest underwater tunnel was built (The Perspective) View
	China Leaves American President Shocked, Builds The Longest Undersea Tunnel In The World (Machine Eye) View
	Exploring the Gotthard Base Tunnel - World's Longest Underground Marve (Gaurmila Revolution) View
	Explore Europe’s Insane $26 Billion Railway Tunnel Across The Alps (Meta Builds) View
	World’s Two Greatest Railway Tunnels: Gotthard Base Tunnel and Severomuysky Tunnel (Railways \| Retro Tech \| DIY) View
	Challenges of Building the World's Longest Railway Tunnel (Monumental Blocks) View
	Inside the $8.7BN Fehmarn Belt Tunnel: The World's Longest Underwater Connection (The Impossible Build) View