Design of the first Hyper-Kamiokande detector tank, which will be located in the Tochibora mine, 295 km from the J-PARC neutrino source. The tank is a cylinder with a diameter of 74 m and a height of 60 m. It will contain a total (fiducial) water mass of 258 (187) kiloton.
Hyper-Kamiokande Collaboration (K. Abe et al.)
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"Physics potentials with the second Hyper-Kamiokande detector in Korea", PTEP 2018 (2018) 6, 063C01, Prog Theor Exp Phys (2018), <a rel="nofollow" class="external free" href="https://arxiv.org/abs/1611.06118">https://arxiv.org/abs/1611.06118</a>, <a rel="nofollow" class="external free" href="https://doi.org/10.1093/ptep/pty044">https://doi.org/10.1093/ptep/pty044</a>