I unfortunatly have a cracked and settleing foundation and found this DIY video while researching, it reminded me of my dad, DIYer and frugal. I got a laugh from it and sent it to him.http://www.youtube.com/watch?v=VcOeUIsrN1Y
It caught me by suprise I was looking for technical info not expecting comedy also. I'm sure the boys did not dig the wholes, they aren't even dirty. And i'm sure the narrator knew a cave in could occur also. It did remind me of my dad, he had I and my brother working hard when we were that age and we complained alot.