18 km long, built using 79 massive concrete elements weighing around 73,000 tonnes each, the project is expected to cut travel time between Denmark and Germany to just 7 minutes by train.
A traveler chasing unusual engineering wonders would probably add this submerged tunnel to the bucket list without thinking twice. Stretching beneath the Baltic Sea, this remarkable project isn’t just another shortcut, it’ll completely change how people move between two European nations.
The world’s longest underwater tunnel promises faster journeys, fewer ferry waits, and honestly… one less excuse to nap at a ferry terminal. News of the giant concrete sections being carefully lowered into the sea has already made headlines worldwide, and it’s easy to see why.
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Engineering That Feels Almost Unreal
The World’s longest immersed tunnel will stretch around 18 km beneath the Baltic Sea. Linking the Danish island of Lolland with the German island of Fehmarn. Instead of drilling through rock, engineers are placing enormous prefabricated sections onto the seabed before sealing them together.
Construction began in 2020, and the route follows centuries of trade connections between Denmark and Germany. It is now getting a seriously futuristic upgrade. Travelers can almost imagine hearing nothing but the soft hum of trains while the sea quietly rolls overhead.
Also Read: Skip the Visa Drama: Germany Visa Free Transit Travel for Indians
Why Travelers Should Care
Once complete, this submerged tunnel means the underwater tunnel will connect Denmark & Germany in just seven minutes by train, replacing much longer ferry crossings. Drivers will also cruise through what’s being called the world’s longest underwater road, making European road trips smoother than ever. Less waiting, fewer weather delays, and honestly, more time for pastries in Copenhagen or seafood along Germany’s northern coast.
Before planning that adventure, travelers can browse the best flight deals online at and pair those savings with this unforgettable submerged tunnel experience.
Frequently Asked Questions – Submerged Tunnel
What is the longest immersed tunnel in the world?
The Fehmarnbelt Tunnel will become the world’s longest immersed tunnel, stretching approximately 18 km beneath the Baltic Sea.
How long is the tunnel between Denmark and Germany?
The Fehmarnbelt Tunnel is around 18 km long and will connect Denmark and Germany in just 7 minutes by train.
What is the longest tunnel in the world underwater?
The Fehmarnbelt Tunnel will be the world’s longest underwater immersed tunnel, measuring 18 km in length.
How much did the Fehmarnbelt tunnel cost?
The Fehmarnbelt Tunnel project is estimated to cost around €7.4 billion (approximately US$8 billion).
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