BudgetGuessr rankings

The most expensive tunnels in our catalogue

The 25 most expensive of 51 built and under-construction tunnels in the BudgetGuessr catalogue, ranked by documented cost in US dollars.

Ranking

  1. 1Taken from a TurboJET after leaving Macau.

    Hong Kong–Zhuhai–Macau Bridge

    People's Republic of China · 2018 · Tunnel$19.18 billion
  2. 2TGV TMST n°3011/2 à la sortie du Tunnel sous la Manche à Coquelles, côté Français.

    Channel Tunnel

    France · 1994 · Tunnel$14.54 billion
  3. 3Sezione tipo di galleria della Nuova Linea Torino Lione

    Mont Cenis Base Tunnel

    Italy · 2026 · Tunnel$12.54 billionUnder constructionEstimate
  4. 4Overhead line installation car in the east tube of the Gotthard Base Tunnel at Faido multifunction station

    Gotthard Base Tunnel

    Switzerland · 2016 · Tunnel$12.38 billion
  5. 5Exploratory Tunnel Aica–Mules

    Brenner Base Tunnel

    Italy · 2007 · Tunnel$11.39 billionUnder constructionEstimate
  6. 6Blick auf die Baustelle der festen Fehmarnbeltquerung auf der deutschen Seite.

    Fehmarn Belt Fixed Link

    Denmark · 2026 · Tunnel$10.57 billionUnder constructionEstimate
  7. 7Photo of construction site of North Melbourne station as part of a community tour day on August 4 2019.

    Metro Tunnel

    Australia · 2024 · Tunnel$8.9 billionEstimate
  8. 8To Osman Gazi Bridge from Altınova side

    Motorway 5

    Turkey · 2019 · Tunnel$7 billion
  9. 9Shenzhen-Zhongshan Link in June 2025

    Shenzhen-Zhongshan Link

    People's Republic of China · 2024 · Tunnel$6.21 billionEstimate
  10. 10Aerial view of west portal of Baltimore and Potomac Tunnel, Baltimore, Maryland

    Frederick Douglass Tunnel

    United States · 2026 · Tunnel$6 billionUnder constructionEstimate
  11. 11Train arriving to Tappi-kaitei Station inside Seikan Tunnel.

    Seikan Tunnel

    Japan · 1988 · Tunnel$5.38 billion
  12. 12Train tunnel Västlänken in Gothenburg, Sweden, under construction. Preparing a service tunnel at Södra vägen in May 2019.

    Västlänken

    Sweden · 2030 · Tunnel$5.02 billionUnder constructionEstimate
  13. 13Marmaray tüp geçiş tüneli

    Marmaray Tunnel

    Turkey · 2021 · Tunnel$4.78 billion
  14. 14Baustelle (Herbst 2019) beim Ostportal des Semmering-Basistunnels (SBT) am Rande der niederösterreichischen Stadt Gloggnitz. Der SBT wird in drei Baulosen errichtet, hat eine Gesamtlänge von 27,3 km und soll 2026 in Betrieb gehen. Das Portal und der Tunnelabschnitt Gloggnitz mit einer Länge von ca. 7,4 Km gehört zum Baulos 1.1., ist mit rd. 450 Mio. Euro budgetiert und wird von den Firmen Implenia Österreich, HOCHTIEF Infrastructure Austria und Thyssen Schachtbau errichtet.

    Semmering Base Tunnel

    Austria · 2024 · Tunnel$4.55 billionUnder constructionEstimate
  15. 15North portal of the Lötschberg base tunnel near Frutigen, Canton of Bern, Switzerland. Right before the tunnel entrance is the so called intervention site. The idea is that trains which are on fire must not stop inside the tunnel but leave the tube if possible and evacuate people here. That's what the stairs are intended for. Firefighter access is provided from the other side.

    Lötschberg Base Tunnel

    Switzerland · 2007 · Tunnel$4.42 billion
  16. 16Camorino, Nordportal Ceneri-Basistunnel und Bahntechnikgebäude

    Ceneri Base Tunnel

    Switzerland · 2020 · Tunnel$3.83 billion
  17. 17Plan of Western Harbour Tunnel and Warringah Freeway Upgrade

    Western Harbour Tunnel

    Australia · 2029 · Tunnel$3.45 billionUnder construction
  18. 18Storebæltsbroen as seen from 'Bro og naturcenter', Sjælland, Denmark.

    Great Belt Fixed Link

    Denmark · 1988 · Tunnel$3.18 billion
  19. 19Clem Jones Tunnel Open Day - Under River

    Clem Jones Tunnel

    Australia · 2010 · Tunnel$2.75 billion
  20. 20Gotthard-Strassentunnel in einer Nord-Süd-Befahrung Foto: Im Tunnel ein Hinweisschild auf die Radiofrequenzen des Tunnelradios

    Gotthard Road Tunnel second bore

    Switzerland · 2025 · Tunnel$2.57 billionUnder construction
  21. 21Intercounty Connector (MD 200) westbound at Mile 11.7 with a MD 182 Layhill Road / Glenmont / Norwood sign

    Maryland Route 200

    United States · 2014 · Tunnel$2.39 billion
  22. 22The north portal of the State Route 99 Tunnel in Seattle, seen from the southbound lanes on opening day, February 2, 2019.

    SR 99 tunnel

    United States · 2019 · Tunnel$2.15 billion
  23. 23One of the tunnels carrying the Northgate Link tunnel, a Link light rail tunnel in Seattle, Washington, seen from Roosevelt station before opening.

    Northgate Link tunnel

    United States · 2021 · Tunnel$1.9 billion
  24. 24Shanghai Yangtze River Tunnel and Bridge

    Shanghai Yangtze River Tunnel and Bridge

    People's Republic of China · 2009 · Tunnel$1.84 billion
  25. 25Figure 4. Located on the corner of First Street and Central Avenue, this figure is predicted to be completed by 2021. The Regional Connector will serve to improve rail connectivity through the Los Angeles County region. Source: Justin Tran

    Regional Connector

    United States · 2023 · Tunnel$1.8 billion

How this ranking works

This is a curated catalogue, not an exhaustive list of every megaproject. Projects are ordered by their recorded US-dollar equivalent; each detail page shows the source amount and any currency conversion. Figures are not adjusted for inflation, and construction bills, estimates, and programme costs can have different scopes. Unbuilt proposals and cancelled projects are excluded.

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