The KM3NeT Collaboration is constructing two deep-sea Cherenkov detectors in the Mediterranean Sea.
The ARCA detector aims at TeV-PeV neutrino astronomy, while the ORCA detector is optimized for
atmospheric neutrino oscillations at energies of a few GeV. The first detection units of the ARCA and ORCA
detectors have been deployed off-shore the South of Italy and France, respectively. In this contribution,
an analysis of the data collected with the first deployed detection units of the ARCA detector and the
selection of a high-purity sample of atmospheric neutrinos is presented.
Atmospheric neutrino events from the first deployed detection units of the KM3NeT-ARCA detector