Abstract
The goal of KM3NeT ARCA is to search for astrophysical neutrinos with a neutrino telescope operating on the bottom of the Mediterranean Sea, at 3500 m depth, for more than 15 years. A key component of the neutrino telescope is the Base Module (BM) which is built with a titanium cylindrical container hosting optics, electronics and power boards. From a mechanical point of view the BM must be water tight and resistant to an external water pressure up to 350 bar, be able to stand all mechanical stresses along its life, provide excellent corrosion resistance for 15 years at least in sea water and be able to host all internal components safely, by guaranteeing an adequate heat dissipation. The tests performed for the qualification of the mechanical design are presented here. The first BM is successfully operating underwater since 2015.
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