Hi, yes the one nemo is referring to is my modification of OLC's excellent environment mod. I changed the underwater color to look m,ore like the green color as seen in Das Boot. If you are interested, I can upload 2 versions. One is the entire OLC mod, the other would be just the ENV data folder in case you want mix that with another environment you use
Try this first (atlantic ocean only):
http://www.gamefront.com/files/20013...Boot_Green_zip