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Kamioka Observatory is a Japanese Cherenkov detector built in an old mine in the 1980s. Since its development, it has been used for a number of experiments, the first (KamiokaNDE) being a search for proton decay: it found none, providing evidence of how rare such decay is assuming it does occur. The following experiment, Kamiokande-II additionally aimed to detect neutrinos, and among its notable results were the collection of data revealing the solar neutrino problem, and the detection of a neutrino burst associated with SN 1987A, i.e., near in time and direction to the visible supernova.