Hyper-Kamiokande Neutrino Observatory Cavern Completed
Kamioka, Hida, Gifu Prefecture, Japan
CONFIRMED89% CONFIDENCEHappened 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
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