The observed increase in the dipole moment of water due to pressure agrees with the results obtained via single-molecule methods, i.e., wall potentials and GOSTSHYP, which additionally found a reversion of this effect at pressures at several hundred GPa. Finally, AIMD simulations revealed that proton hole (OH -) migration in water is strongly suppressed at pressures above 10 kbar, but proton (H + ) migration remains unaffected in this pressure range. Figure : Phase diagram of SiO 2 . The black curve with diamond symbols represents the bondedto-atomic liquid transition found by Zhang et al. Reproduced with permission from Zhang et al., Copyright 2022, AIP Publishing.