hi, i used to use a 10Bar housing for canon g5, it's rock solid, as deep as 90m. hence the name 10bar. there's no Canon housing for this.
but i've gone deeper into the dark side and now use a D70/F5 underwater.
some pics of underwater models here.
**DISCLAIMER**
It's nothing fantastic...blah blah blah
*************
http://sg.homeunix.com/gallery-paul/underwatermodelshoot