Attached Link: http://www.3dart4u.com/1024/index.htm

If you'd like to experiment with some underwater mats and skies you could do worse than Menno's Underwater package. It's at the link, click on the whale image.

January's Challenge at this site was 'Underwater Realism with Bryce' with some 70 odd entries won by Agent Smith.
Well worth a look through for some of the best underwater images posted at Renderosity.

Realistic underwater images are recognosed as the most difficult to master with Bryce so good luck with your efforts, your coming along nicely.
Bye now...........Dennis