Hydrogen-filled ices (HH) are emerging as a new class of quantum materials, where hydrogen molecules are quantum-mechanically coupled to a crystalline water lattice. Under high pressure, the two sublattices — hydrogen and water — form an intertwined quantum network in which nuclear quantum effects dominate molecular rotation, hydrogen-bond symmetrization, and lattice dynamics. Recent discoveries of dense metastable phases (C0, C2, C3) reveal ultra-short H₂–H₂O contacts and exceptional H₂:H₂O ratios, unlocking unprecedented hydrogen confinement. This internship will investigate these dual-quantum systems through high-pressure neutron and synchrotron scattering, combined with quantum simulations, to uncover how quantum fluctuations can stabilize novel hydrogen-rich frameworks for solid-state hydrogen storage.