Our thanks these folks who provided free resources.

https://github.com/GoldenMaximo/CSS-Realistic-Water
https://stackoverflow.com/questions/13953053/animate-bubbles-upwards-continuously-with-css3
https://codepen.io/monchito/pen/RPEqvo
https://codepen.io/piut0/pen/dyaezEN
https://codepen.io/elchiconube/pen/naxOWv
Image by macrovector on Freepik
Image by NACreative on Freepik
Image by freepik