One of the SNO+ detector goals is the search for neutrinoless double-beta decay, a rare process which if detected, will prove the Majorana nature of the neutrinos and give a measurement of the neutrino absolute mass. Additional physics goals of SNO+ include the study of solar neutrinos, anti-neutrinos from nuclear reactors and the Earth's natural radioactivity as well as Supernovae neutrinos. Located in the deepest underground neutrino physics laboratory (SNOLAB, Canada) it will re-use the SNO experiment ~9000 PMTs looking at a 12 m diameter spherical volume filled with 780 tons of Te-loaded liquid scintillator. The commissioning of the detector at SNOLAB has already started, with air and partially-filled with water runs. A short phase with the detector completely filled with water is expected to start at the end of the year, before running the detector with scintillator in 2015. In this presentation I will describe in details the neutrinoless sensitivity physics goals that SNO+ aims to achieve, as well as the main detector developments and technical challenges inherent to large volume liquid scintillators and low-energy double-beta decay neutrino (and neutrinoless) events.
