I haven't watched the video yet... So this reply isn't necessarily about that specifically. But on the topic of Safe Cracking. That is some pretty crazy shiz. I was reading an article prolly a year or two ago about it. The methods are pretty crazy and a lot more detailed than most people would think. Using the stethoscope to hear the ticks even was more than what most people think it is. The ticks don't tell us what numbers are used in the combination, they were used to tell us how many wheels are in the particular safe. In all honesty, it can get to a pretty complicated deal.
Check this article out: http://home.howstuffworks.com/home-impr ... cking3.htm