I created this lighting by applying a caustics sequence to a spotlight. This lighting will make my animation look more underwater and gives it the effect that I was looking for. In after effects I will apply rays of light and other effects to make these more convincing, but I like this effect as it is as well. I will change the pattern a bit and make it a little blurrier in some scenes as it can look quite strong, but I can easily turn it down and control where I want it.
Full skydome light and spotlight with high exposure.