Waterfalls aren’t real, they’re obviously just localized gravity inversions affecting very condensed, continuous cold water geysers. Anyone who’s done their own research can see through the lies of big waterfall

It would have punched through leaving a giant hole where all the water runs out

12v fans will typically run fine, albeit much slower at 5v. This was a favorite trick many moons ago to reduce fan noise in desktops before quiet fans became mainstream. The main watch out is that the fan doesn’t stall at startup and fail to spin completely.