Board Thread:General Discussions/@comment-27255656-20170327091438/@comment-860045-20170327154414

He can but it was only seen in Godzilla and Mothra: Battle for the Earth and GMK. Other than that, not much. However, in the Showa era, Godzilla did use his atomic breath on water. The effects were mostly steaming the surface.

The Heisei era, the Atomic Breath would cause water explosions when aimed on the surface. The Millenium series often varies depending on film to film. So my suggestion is to watch some of them to get the better idea of it. Rather than me saying really.