建設中のカミオカンデ配管外れる　作業の5人吹き飛ばされ重軽傷|47NEWS（よんななニュース）

This page reports an accident at the Hyper-Kamiokande, a next-generation observatory under construction in Hida City, Gifu Prefecture. On the 31st, a pipe detached in the tunnel, causing pressurized air to burst out and injuring five male workers aged 20-60. A man in his 60s suffered intracranial hemorrhage and a man in his 30s suffered a fractured collarbone, both critical injuries, while the remaining three sustained minor bruises. The accident occurred during a leak-check operation when a connecting pipe section detached, causing workers to be blown over. The facility aims to begin observations in 2028.