Recently (with my G10). I start to experiment subject in a mid water(or in the blue) and try to get a sun ray background. To be honest is not easy to capture this kind of scene. But this can be solve by creating fake ray in Photoshop. Using Cloud and radial blue effect. (i had published the tutorial of creating the sunray in youtube and some other website previously. Just google heheheh).
Now im diving with a group of researcher/scientist. We making an experiment on underwater color effect with florescence and UV light and some other experiment which i cant understand hehehehe. Hopefully i can have a good shoot later. 🙂