This is a dream come true! I've always imagined something like this, and I'm stoked that someone pulled it off (for a while at least). Can you imagine all of the contractors, electricians, etc that were in on this? That is a huge operation. I saw something somewhat impressive in a documentary "The Union". There were 20 shipping containers buried underground 10x10. I'm not going to tell you anymore. Check it out.
YouTube - Underground grow op
It's funny reading everyone's speculations into how these guys got busted. It was this, it was that, coulda, shoulda, woulda. The bottom line is they got busted. These people were obviously growing with just the intent for profit. When you become so tied up in the lust for money, bad things are bound to happen. Money can make your best friend or even worse, a loved one, turn against you.
I feel bad for the families of these genius's. It would be great if marijuana was legalized in the next 10 years, as I would think they would have to let everyone w/ marijuana offenses out of jail(it would be nice if there was some sort of reparation for all who have had marijuana convictions on their record). Can you imagine all of the phenomanol growers who have been busted over the last 30-40 years who would be able to apply their knowledge in the present day?