Immersed tube

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Science and technology

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What Wikipedia says

An immersed tube (or immersed tunnel) is a kind of undersea tunnel composed of segments, constructed elsewhere and floated to the tunnel site to be sunk into place and then linked together. They are commonly used for road and rail crossings of rivers, estuaries and sea channels.

Excerpt from the Wikipedia article “Immersed tube”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Yupi666 at en.wikipedia, CC BY 3.0, via Wikimedia Commons.