KM3NeT: From the Cosmos to the Sea

Neutrinos are particles that can tell us much about our Universe. Due to their neutral, stable, and weakly interacting nature, neutrinos are valuable for studying various astrophysical phenomena including supernovae, Active Galactic Nuclei, the diffuse galactic neutrino flux and dark matter. However, neutrino fluxes at high energies are very low, which makes it indispensable to build very large detectors. The KM3NeT collaboration currently builds two large volume neutrino telescopes in the Mediterranean Sea to investigate phenomena from the with energies in the GeV to PeV range. These two detectors are called ARCA (Astroparticle Research with Cosmics in the Abyss) and ORCA (Oscillation Research with Cosmics in the Abyss). The ARCA detector is designed to detect high-energy astrophysical neutrinos, whereas the ORCA detector is optimised for less energetic neutrinos. The combination of these two detectors allows for a comprehensive understanding of cosmic-energy neutrino sources. ARCA and ORCA comprise multi-PMT optical modules that have been carefully designed and assembled in numerous integration sites across Europe and Morocco. This work aims to give an overview of the KM3NeT telescope technology, construction processes and deployment.