how to make swimming pool underwater

Hi

I'd like to make underwater of swimming pool.

https://preview.redd.it/g2lc09zi2gng1.png?width=659&format=png&auto=webp&s=6d07212f3a3645ad04b9426acdb77ba2b0199b1a

I tried ocean spectrum and rendering.

how to do shader and render this?

if I tried rendering ocean spectrum, it looks too dark ( top view wasn't dark)

Should I place light under ocean spectrum?

Thanks for your advice!