Argh - yes, it's rated for 1m 30 minutes, but that's at room temperature with no movement. If you're moving around the pressures on it could end up higher than if it's just stationary 1m below the surface.
It could take quite a while to dry out (a week or more) so it's worth just trying to leave it somewhere warm and dry for quite a while. Don't try and charge is during that time since having voltage on it when wet will just make things worse - just leave it flat - and maybe with a bit of luck it'll come back to life when you charge it.
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