For Setting as Desktop wallpaper ( windows ) : To set this picture as desktop wallpaper , right click on the wallpaper and select set as desktop backgroud ( you may then choose the wide , center or normal form in second level ). Download 3d Wallpaper Desktop Under Water.jpg
for mac users : drag the above "3d Wallpaper Desktop Under Water.jpg" to desktop and use appearence control panel to set as your desktop background