KM3NeT

thumb|The KM3NeT LOM (Launching vehicle of Optical Modules) being loaded onto the RV Pelagia deployment vessel. A full string detection is rolled onto the LOM. After arrival at the seabed the string is unrolled to its full length.|250x250pxthumb|KM3NeT Digital Optical Module (DOM) in the laboratory|250x250pxThe Cubic Kilometre Neutrino Telescope, or KM3NeT, is a European research infrastructure located on the bed of the Mediterranean Sea at depths of over 2 kilometres. It hosts water Cherenkov neutrino telescopes designed to detect and study neutrinos from distant astrophysical sources as well as from our own atmosphere, contributing significantly to both astrophysics and particle physics knowledge.

Arrays of thousands of optical sensor modules detect the faint Cherenkov light in the deep sea from charged particles originating from interactions of neutrinos in water or rock in the vicinity of the detector. The position and direction of the optical modules and the time of arrival of the light on the photomultipliers inside are recorded with high precision. Properties of the particles, like their trajectory and energy, are reconstructed from these measurements.