Already in the low temperature region of water adsorption behaviour in natural zeolites, the faujasites, two important questions arise that require further investigation: (i) what is the most likely configuration of water molecules of tetrahedral symmetry inside the faujasite cages, and (ii) what is the possible role of nuclear quantum tunnelling (NQT) in the dynamics of confined water molecules. This proposal aims at shedding more light on these two important questions by performing Neutron Compton scattering (NCS) experiments on H2O confined in the NaY faujasite network across three temperature regions (i) liquid-to-liquid transition of water at 225 K, (ii) fragile to strong water dynamics crossover, and (iii) water crystallization below 160 K, at three different water loading levels in the faujasite framework.