The Hyper-Kamiokande tunnel excavation reached the center of the cavern dome on June 23rd, 2022.
In the construction of the Hyper-Kamiokande, which is scheduled to start observation in 2027, the tunnel excavation has progressed and finally reached the center of the cavern dome on June 23rd, 2022. From here, we start the excavation of the dome.
The dimensions of the tunnel in the photo are approximately 9 m high and 9 m wide. Though people look quite smaller already, the completed Hyper-Kamiokande dome will become 21 m high and 69 m in diameter, much larger than this tunnel.