DUNE Far Detector Caverns Excavation Completed

More like this

• Science09/15/2026@BuildDesk

  Hyper-Kamiokande Neutrino Observatory Cavern Completed

  Kamioka, Hida, Gifu Prefecture, Japan

  

  Starts 07/31/2025CONFIRMED89% CONFIDENCE1.1 years agoHappened as dated, per the source^[1]: "the University of Tokyo completed excavation of the colossal cavern that will house the main detector volume of Hyper-Kamiokande" on July 31, 2025.

  Crews finished excavating the huge cavern in a Japanese mountain that will house the Hyper-Kamiokande neutrino observatory, a step toward the detector's planned start of observations.

  $600M

  0.74

  00
• Architecture09/14/2026@BuildDesk

  Sphinx Observatory Opens Atop the Jungfraujoch

  Jungfraujoch, Bernese Alps, Switzerland

  

  Starts 12/31/1937CONFIRMED87% CONFIDENCE88.7 years agoHappened as dated, per the source^[1]: "The Sphinx observatory ... was completed in 1937."

  The Sphinx Observatory, a research station tunnelled into a 3,571-metre Alpine summit above the Jungfraujoch, was completed in 1937 as one of Europe's most remote scientific buildings.

  0.65

  00
• Transport09/15/2026@BuildDesk

  TBM Wanda Completes Drilling of the Albvorland Tunnel

  Wendlingen am Neckar, GermanyImplenia

  

  Starts 10/29/2019CONFIRMED75% CONFIDENCE6.9 years agoImplenia's^[4] own project news release dates the southern tube breakthrough to 29 October 2019.

  Tunnel boring machine Wanda finished excavating the southern tube of the Albvorland Tunnel, the last major breakthrough on Deutsche Bahn's Stuttgart-Ulm high-speed line. The 8-kilometer twin-tube tunnel near Wendlingen am Neckar was built by Implenia and cuts travel time between Stuttgart and Ulm to roughly 30 minutes.

  0.65

  00
• Energy09/22/2026@EnergyDesk

  The First 412,000 Barrels Go Underground at West Hackberry

  US Department of EnergyWest Hackberry Strategic Petroleum Reserve, Hackberry, Cameron Parish, LA 70645, United States

  Starts 07/21/1977CONFIRMED90% CONFIDENCE49.2 years agoDOE's own 40th-anniversary piece gives the day: "On July 21, 1977, the SPR received its first oil delivery."^[1]

  The Strategic Petroleum Reserve took its first delivery on 21 July 1977: about 412,000 barrels of Saudi Arabian light crude, pumped into salt caverns near Lake Charles, Louisiana. Construction had started that April, when the government bought up existing caverns along the Gulf Coast rather than wait to dig its own.

  0.64

  00
• Architecture09/14/2026@BuildDesk

  Salt Lake Temple Completes Seismic Base-Isolation Retrofit

  Salt Lake Temple, Salt Lake City, UT, United StatesThe Church of Jesus Christ of Latter-day Saints

  

  Starts 06/30/2026CONFIRMED88% CONFIDENCE85 days agoHappened as dated, per the source^[1]: "Starting Thursday, June 25, construction crews removed over 1,500 bolts connecting 392 plates to the base isolators."

  Crews finished installing a base-isolation system beneath the 19th-century Salt Lake Temple as part of an estimated $2.4 billion project to let the building float free of the ground during a major earthquake.

  $2.4B

  0.64

  00
• Science09/11/2026@ThePinGang

  Deep Underground Neutrino Experiment Begins

  Lead, South DakotaFermilab

  

  Starts 06/01/2031ESTIMATED63% CONFIDENCEin 4.7 yearsGiven as a target, not a fixed date, per the pin description: "…unting for matter-antimatter asymmetry. Estimated date.…"

  A neutrino beam fired 1,300 km from Fermilab to detectors a mile underground in South Dakota, hunting for matter-antimatter asymmetry. Estimated date.

  $5B

  0.63

  00
• Transport09/15/2026@BuildDesk

  Faroe Islands Open the Sandoy Undersea Tunnel

  Skopun, Sandoy, Faroe Islands

  

  Starts 12/21/2023CONFIRMED89% 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 260M

  0.63

  00
• Science09/15/2026@BuildDesk

  Marmaray Tunnel Excavators Uncover Constantinople's Theodosian Harbor

  Yenikapı, Fatih, Istanbul, Turkey

  

  Starts 11/01/2005ESTIMATED62% 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.

  0.63

  00
• Infrastructure09/15/2026@BuildDesk

  Afsluitdijk's Storm-Proofing Upgrade Wraps Up in the Netherlands

  Breezanddijk, Afsluitdijk, NetherlandsLevvel

  

  Starts 06/01/2023ESTIMATED64% 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.

  $617M

  0.63

  00
• Mining09/15/2026@BuildDesk

  TAKRAF Commissions the First F60 Overburden Conveyor Bridge at Welzow

  Welzow, Brandenburg, GermanyTAKRAF

  

  Starts 01/01/1972ESTIMATED65% CONFIDENCE54.7 years agoWikipedia's^[2] Overburden Conveyor Bridge F60 article dates the first unit's construction to 1969-1972 and entry into service at the Welzow open-pit mine to 1972, without a specific day.

  VEB TAKRAF completed the first F60 lignite overburden conveyor bridge at the Welzow open-pit mine, creating what is still recognized as the largest mobile land machine ever built.

  0.63

  00
• Energy09/22/2026@EnergyDesk

  Chornobyl NPP Accepts Novarka's New Safe Confinement Into Operation

  NovarkaChernobyl Nuclear Power Plant, Chornobyl Exclusion Zone, Ukraine

  Starts 11/08/2017CONFIRMED90% CONFIDENCE8.9 years agoUkraine's Chornobyl NPP states it accepted the New Safe Confinement's Enclosing Perimeter into operation on 8 November 2017 (chnpp.gov.ua^[2]).

  Ukraine's Chornobyl Nuclear Power Plant formally accepted the New Safe Confinement's Enclosing Perimeter from builder Novarka, completing the giant arch meant to contain the ruined Reactor 4 for a century. The 36,000-tonne steel structure, the largest movable land-based structure ever built, had been skidded into place over the old sarcophagus in November 2016.

  0.62

  00
• Science09/15/2026@BuildDesk

  KONE Reopens Its Deep-Mine Elevator Test Lab in Tytyri, Finland

  Tytyri, Lohja, FinlandKONE Corporation

  

  Starts 03/29/2017CONFIRMED90% CONFIDENCE9.5 years agoHappened as dated, per the source^[1]: "has unveiled its renewed high-rise elevator testing facility in Tytyri, Finland, after extensive renovations."

  KONE finished renovating its underground elevator testing facility inside a Finnish limestone mine, extending its shafts to the world's deepest for free-fall and speed testing.

  0.62

  00