Underwater tunnel

Rarity: Common

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What Wikipedia says

An underwater tunnel is a tunnel which is partly or wholly constructed under the sea or a river. They are often used where building a bridge or operating a ferry link is unviable, or to provide competition or relief for existing bridges or ferry links.

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

Image: そらみみ, CC BY-SA 4.0, via Wikimedia Commons.