Dave I was wodering about your comment of chopping through fire extinguishers. Was this some sort of test?
I didn't personally do it, but some months ago I came across pictures of someone batoning a Swamp Rat knive clear through a fire extinguisher. It did a number on the extinguisher, but the Swamp Rat was perfectly fine.
There's also been a number of tests where they have chopped clear through concrete blocks with no damage other than the blade becoming significantly dull.