Schematic representation of the ANTARES neutrino telescope [2].

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... ANTARES neutrino telescope was deployed in the Mediterranean Sea, 40 km from the coast of Toulon (France), at a depth of around 2.4 km. It was completed in 2008. The main goal of ANTARES is, at high energies, the study of energetic astrophysical objects. However, at lower energies, neutrino oscillations can be measured by analyzing distortions in the energy/angular spectrum of upward-going atmospheric neutrinos. ANTARES is composed of 12 detection lines, each one equipped with 25 floors of 3 optical modules. Each OM holds a photomultiplier tube (PMT). The horizontal spacing among the lines is around 60 m, while the vertical spacing between the storeys is around 15 m (see Figure 1). The OMs in a storey are arranged in such a way that the axis of the PMTs points 45 • downwards (see Figure 2). The photomultipliers are 10-inch tubes from Hamamatsu. The relative positions of all OMs in the detector are monitored in real time by a dedicated positioning ...