It's the latest Corona version with the latest Max.
I don't want to be that pain in the
neck guy, but when asked about versions, please always provide specific numbers. "Latest Corona version" would mean Corona 11 Hotfix 1 as well as 05.03 Corona 12 daily build.
There is some additional information about underwater rendering here:
https://support.chaos.com/hc/en-us/articles/11905001704977-New-Volume-Resolving-in-Corona-10 I am not sure, but maybe it will be useful to you.
Do you have the "physical size" option enabled in your camera?
What exactly are you trying to achieve? Is it something like a camera fly-through where the camera is passing through an aquarium at some point?
Lastly, the best idea may be submitting a support ticket here:
https://support.chaos.com/hc/en-us/requests/newPlease attach your scene there, if possible.