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Switzerland Built the World's Longest Tunnel
World's longest tunnel opens deep beneath Swiss Alps
Swiss complete worlds longest tunnel
World's Longest Tunnel - How It Was Built - Full Documentary
Keeping the world's longest railroad tunnel safe
Swiss complete world's longest tunnel
Opening Ceremony of Worlds Longest Tunnel (Gotthard/Switzerland)
Swiss complete world's longest tunnel Congradulation from PlumberX
Switzerland - 20 Cool Facts! 🇨ðŸ‡
INCREDIBLE SWITZERLAND BIGGEST TUNNEL BORING MACHINE DIAMETER-HOW DOES TUNNEL BORING MACHINE WORK?
World's longest tunnel opens beneath Swiss Alps
Gotthard Tunnel Opening Ritual (Shocking)
