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How Do They Build Underwater Tunnels?
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Every Hourwiz video gets a page for its maths, assumptions and sources. This page lists the sources we used while researching this one. The step-by-step maths and assumptions are being written up and will land here.
Sources
Every fact on this page comes from these pages, opened on October 2026. Things change: check the live page before you rely on it.
- sundogbaelt.dk/en/road-and-rail-links/the-fehmarnbelt-link/fac
- practical.engineering/blog/2025/5/20/the-most-implausible-tunneling-m
- femern.com/press/news/the-fehmarnbelt-tunnel-is-approachin
- femern.com/press/news/first-tunnel-element-of-the-fehmarnb
- femern.com/press/news/first-tunnel-element-prepared-for-im
- transport-online.de/en/news/fehmarnbelt-how-work-tunnel-progressing
- femern.com/press/news/the-first-element-of-the-fehmarnbelt
- patents.google.com/patent/US10018043
- tunnel.ita-aites.org/en/component/seoglossary/1-main-glossary/281-ga
- constructionequipmentguide.com/the-worlds-longest-immersed-tunnel/67668
- bart.gov/node/12400
- fhwa.dot.gov/eihd/twtunnel.cfm
- asce.org/publications-and-news/civil-engineering-source/
- asce.org/about-civil-engineering/history-and-heritage/hi
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