Biggest Subwoofer Ever Made

I ran across this article about a 60 inch subwoofer. What kind of bass traps would you need for this thing?
Back in 1959 Electro Voice introduced a 30 inch woofer. I have the specs and cabinet plans at home, the volume about the size of a small bathroom.
Can I combine the 10 ten-inch drivers on my SW800's and count it as 100 inches? ;-)
You think that's big? Check this thing out. You have to scroll down a little.