How the world's longest underwater tunnel was built - Alex Gendler
How Europe's Building the World's Longest Underwater Tunnel!
How the world’s largest underwater tunnel is being built | BBC News
The NEW longest underwater tunnel!
The $11B Tunnel That Could Save One of Europe’s Busiest Mountain Corridors | WSJ Breaking Ground
Unbelievable! The sea is full of water, how is the undersea tunnel built?
ヨーロッパは世界最長の海底トンネルをどうやって建設しているのか？
How Germany and Denmark Are Building the World’s Longest Immersed Tunnel
World longest underwater tunnel between Germany and Denmark
Germany and Denmark are building the world's longest underwater rail and road tunnel | DW News
The Channel Tunnel: The World's Longest Underwater Tunnel
How Underwater Tunnels Are Built?
Europe Is Building The World’s LONGEST UNDERWATER TUNNEL
World's longest underwater rail and road
Inside the World's Longest Underwater Tunnel – Fehmarnbelt Tunnel
The Science Behind Constructing The Worlds Longest Underwater Tunnel | Super Structures Episode 2
Inside the $8.7BN Fehmarn Belt Tunnel: The World's Longest Underwater Connection
The Impossible Construction of World's Longest Undersea Tunnel
The Channel Tunnel: Building the World's Longest Undersea Link
