Acid water pit, colormap doesn't work

Hi, I am trying to make an acid pool, my problem is that the colormap doesn't work when I am in underwater the color of the pool is the normal one, and it have to be dark green, I am sure that the code is correct but only for precaution here it is "#00A020Z", I already have an idea of whatt is wrong, in the control sector of the colormap have an action its number is 16 and its unknow to the program, so if someone could tell me the number of this action in the new version I will be pleased, even if this isn't what is giving me trouble, but please help me solve this thankyou.

Make the "16 - Unknown" into Lighting and Colormap > Colormap

It'll apply the colormap to whatever is tagged.