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Faroe Islands Open the Sandoy Undersea Tunnel
Skopun, Sandoy, Faroe Islands
CONFIRMED89% CONFIDENCE2.8 years agoHappened as dated, per the source[1]: "the Sandoyartunnilin tunnel opened on 21st December 2023."The Faroe Islands opened the Sandoyartunnilin, an 10.8km subsea tunnel linking Streymoy to the island of Sandoy, replacing a ferry crossing that could take an hour or more.kr 260M0.75Stad Ship Tunnel Construction Pushed to Early 2027
Stadlandet, Norway
DELAYED3 years late64% CONFIDENCEin 100 daysGiven as scheduled, per the source[1]: "the aim of starting construction in the beginning of 2027."Norway's plan to blast the world's first full-scale ship tunnel through the Stad peninsula has cleared its funding hurdles, with construction now set to begin in early 2027.kr 8.6B0.70Silvertown Tunnel Opens Under the Thames
CONFIRMED90% CONFIDENCE1.5 years agoHappened as dated, per the source[1]: "The Silvertown Tunnel will open on 7 April 2025, as confirmed by TfL[2]."Transport for London opened the Silvertown Tunnel, a new road crossing under the Thames built to relieve the perennially congested Blackwall Tunnel a few hundred metres away.$2.8B0.68Fehmarnbelt Tunnel Opens
Rødbyhavn, Denmark
ESTIMATED70% CONFIDENCEin 2.7 yearsGiven as a target, not a fixed date, per the pin description: "…enhagen rail travel to about 2.5 hours. Estimated date.…"An 18 km immersed tunnel under the Baltic links Denmark and Germany, cutting Hamburg to Copenhagen rail travel to about 2.5 hours. Estimated date.kr 52.6B0.68Mont Cenis Base Tunnel Opens
SCHEDULED84% CONFIDENCEin 7.3 yearsGiven as scheduled, per the source[1]: the base tunnel "is expected to be commissioned by the end of 2033"; telt.eu[2] confirms "La date d'achèvement est prévue en 2033", a year later than the earlier 2032 target.At 57.5 km, the Mont Cenis Base Tunnel will be the world's longest rail tunnel, carrying the new Lyon–Turin railway under the Alps between Saint-Jean-de-Maurienne, France, and Susa, Italy.€11.1B0.67Sydney Western Harbour Tunnel Set to Open
Warringah Freeway, Cammeray, Sydney, NSW, Australia
SCHEDULED80% CONFIDENCEin 2.3 yearsGiven as scheduled, per the source[1]: "Western Harbour Tunnel remaining on track to open to traffic in 2028".Sydney's Western Harbour Tunnel, redesigned mid-build from a cut-and-cover crossing to twin bored tunnels, is on track to open beneath the harbour in 2028.0.66Hong Kong Opens the Sha Tin to Central Link's Cross-Harbour Extension
CONFIRMED90% CONFIDENCE4.4 years agoHappened as dated, per the source[1]: the cross-harbour section was set to "fully open on May 15," reported days ahead of the 2022 launch.Hong Kong's MTR opened the cross-harbour section of the Sha Tin to Central Link, an immersed-tube rail tunnel under Victoria Harbour that gave Hong Kong Island a fourth rail link to Kowloon.$11.6B0.65Marmaray Tunnel Excavators Uncover Constantinople's Theodosian Harbor
Yenikapı, Fatih, Istanbul, Turkey
ESTIMATED62% CONFIDENCE20.9 years agoAccounts of the Marmaray excavation (Grand Sirkeci[3] Hotel's history page and the Harvard 'Urban Imagination' exhibit) place the discovery of the silted-up harbor at Yenikapı in November 2005, without a more precise day recorded.Digging for Istanbul's Marmaray rail tunnel at Yenikapı, workers strike the silted-up remains of the Theodosian Harbor, a Byzantine-era port that would go on to yield 37 shipwrecks and roughly 100,000 artifacts.0.65Lyon-Turin Base Tunnel Targeted for 2033 Completion
ESTIMATED72% CONFIDENCEin 7.3 yearsGiven as scheduled, per the source[1]: "The project is expected to be completed by 2033."TELT, the joint French-Italian agency building the Mont d'Ambin base tunnel under the Alps, is now aiming to finish the roughly 57km bore by the end of 2033.€11.1B0.65Second Gotthard Road Tunnel Due to Complete
SCHEDULED76% CONFIDENCEin 4.3 yearsA mid-2025 setback added cost and rework but the project team says it is still on schedule. Given as scheduled, per the source[1]: "It is due to be completed in 2030."Switzerland's second bore under the Gotthard Pass, approved by referendum in 2016 to let the original 1980 tunnel close for renovation without cutting off the A2, is on track to finish by 2030.$2.7B0.65Construction Begins on New York's Hudson River Rail Tunnel
North River Tunnel, Weehawken, New Jersey
CONFIRMED89% CONFIDENCE2.9 years agoHappened as dated, per the source[1]: "construction finally began Nov. 3 on the Hudson River Tunnel portion of the Gateway Program[2]".Crews broke ground on the Hudson Tunnel Project, a new rail tunnel meant to relieve the century-old, storm-damaged North River Tunnel beneath the Hudson River.0.65Afsluitdijk's Storm-Proofing Upgrade Wraps Up in the Netherlands
ESTIMATED64% CONFIDENCE3.3 years agoHappened as dated, per the source[1]: "completed the work in 2023."The Levvel consortium finished reinforcing the 32-kilometre Afsluitdijk sea wall with tens of thousands of custom concrete blocks so it can withstand a one-in-10,000-year storm.$617M0.64
