Base tunnel

Rarity: Common

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At a glance

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Notion

Domain

Science and technology

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What Wikipedia says

A base tunnel is a type of tunnel, mainly a railway tunnel, that is built through the base of a mountain pass. This type of tunnel typically connects two valleys at about the same altitudes.

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

Image: --Cooper.ch 19:30, 12 August 2006 (UTC), Public domain, via Wikimedia Commons.