It really does depend on where you`re willing to dive. After all, to dive, all you need is water deep enough to cover you and your tank right. After all, this site, lists HAZMAT diver. Want to dive under a land fill or in a sewer? _______________________________________________________ http://www.geocities.com/CapeCanaveral/Lab/3518/DH-HazDive.htm ______________________________________________________ Can you think of a state with no sewers? How`s that for a new perspective on the subject.