  At about 40 km off the coast of Toulon (France), anchored at 2475 m deep in
the Mediterranean Sea, there is ANTARES: the first undersea neutrino telescope
and the only one currently operating. The detector consists of 885
photomultiplier tubes arranged into 12 strings of 450-metres high, with the aim
to detect the Cherenkov light induced by the charged superluminal interaction
products of neutrinos. Its main scientific target is the search for high-energy
(TeV and beyond) neutrinos from cosmic accelerators, as predicted by hadronic
interaction models, and the measurement of the cosmic neutrino diffuse flux,
focusing in particular on events coming from below the horizon (up-going
events) in order to significantly reduce the atmospheric muons background.
Thanks to the development of a strategy for the identification of neutrinos
coming from above the horizon (down-going events) the field of view of the
telescope will be extended.
