Скачать или смотреть How Denmark & Germany Build the World’s Biggest Immersed Tunnel (18 km Fehmarnbelt)

How do you build an 18 km undersea tunnel… without drilling?
In the Fehmarnbelt Strait between Denmark and Germany, engineers are building an immersed tunnel by creating 89 massive concrete elements on land—then floating, towing, ballasting, and sinking them into a prepared seabed trench with near-perfect alignment.

In this documentary-style breakdown, you’ll see:

The “impossible crossing” and why the sea conditions matter

The mega factory built to mass-produce tunnel elements

Rebar → formwork → continuous concrete pour → curing → inspection

The surreal moment a 73,000-ton concrete block floats, gets towed, then “Begin immersion” starts controlled sinking

How elements connect and seal under massive water pressure

Educational / AI disclosure: This video is created for education and engineering explanation. Visuals may be AI-generated/AI-assisted to illustrate construction steps and scale; no real-world footage claims are implied.

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