Future neutrino telescopes in water and ice

The discovery of high-energy cosmic neutrinos by IceCube in 2013 has made neutrino astronomy become reality. It is becoming clear, however, that exploiting its full scientific potential will require increasingly precise data, as well as full sky coverage. The future projects addressing these objectives - KM3NeT/ARCA, Baikal/GVD and the IceCube upgrade/Gen2 - and their science potential are discussed. A second thread of activities targeting lower-energy atmospheric neutrinos for oscillation studies, and in particular for the determination of the neutrino mass hierarchy, is also presented. These projects - KM3NeT/ORCA, IceCube Upgrade/Gen2 - employ very similar detection technologies as their high-energy siblings and are expected to become operational within a few years from now.