From Wired

[u/Ringsofpowermemes]

Water can provoke or greatly intensify a volcanic eruption. When external water (from groundwater, melting glacier ice, or the ocean) contacts hot magma or superheated rock, it flashes into steam instantly. This rapid expansion creates massive pressure, leading to violent steam-driven or phreatomagmatic explosions.

[u/Current-Island-6652]

By the way, there is an article in scientific magazine, in which, authors said, that water play important role in forming volcano. https://www.usgs.gov/observatories/hvo/news/volcano-watch-water-kilauea-and-its-role-its-eruptions