  We investigate the possibility of achieving high-temperature
superconductivity in hydrides under pressure by inducing metallization of
otherwise insulating phases through doping, a path previously used to render
standard semiconductors superconducting at ambient pressure. Following this
idea, we study H$_2$O, one of the most abundant and well-studied substances, we
identify nitrogen as the most likely and promising substitution/dopant. We show
that for realistic levels of doping of a few percent, the phase X of ice
becomes superconducting with a critical temperature of about 60 K at 150GPa. In
view of the vast number of hydrides that are strongly covalent bonded, but that
remain insulating until rather large pressures, our results open a series of
new possibilities in the quest for novel high-temperature superconductors.
