The Hyper-Kamiokande detector is a next generation water Cherenkov detector, 10 times larger than its predecessor, Super-Kamiokande, and currently under construction. The Hyper-Kamiokande detector is both a ‘microscope’, used to observe elementary particles, and a ‘telescope’ for observing the Sun and supernovas using neutrinos. Its main aim is to elucidate Grand Unified Theories and the history of the Universe through an investigation of proton decay and CP violation (the difference between neutrinos and antineutrinos), together with the observation of neutrinos from the Sun and supernova explosions. The EPAP group has several leadership positions in the experiment and contributes in a number of crucial areas (photosensors, DAQ, calibration, computing, software and analysis).