 The KM3NeT-It site, at a depth of 3400 m, hosts the ARCA ("Astroparticle Research with Cosmics in the Abyss") detector, with more widely spaced DOMs optimised for detecting high-energy cosmic neutrinos in the TeV–PeV range.Its strings are 650 m long, spaced 90 m apart.The KM3NeT-Fr site, at a depth of 2475 m, hosts the ORCA ("Oscillation Research with Cosmics in the Abyss") detector, a more compact array with more closely spaced sensors optimised for atmospheric neutrinos in the GeV range.