I think the best way to learn, is to gather knowledge from those before you. Good and bad and learn from it.
I was hoping to find video footage on the net as it is still vivid in my head as when I first saw it. 1990....... Joe Burrus dies, buried alive in wet cement and it caved in, crushing him. He has done the escape one week before and it worked with dirt, he thought he knew what he was doing and ramped it up a notch.
Do a search for "Joe Burrus escape died"
I seen that on Mindfreak.