Storm water drain test render1

As the title says.. was just experimenting with volumetric lighting.
This is a current project im working on, its prodominatly a scene modeling exercise,
final peice will be a 30 second camera walk through. there will be wild mushrooms growing,
glowing grubs/worms and other fantastic and interesting things going on.

And yes i do go down and explore the storm water drains of melbourne, it's an old hobby of mine.

all done in lightwave 8.5

anything wrong? please tell me ^_^