http://www.bbc.co.uk/news/world-latin-america-11056607
What sort of state are these guys going to be in when they get out? Physically they may be fine, but living in enforced close confinement with 30 other guys for that long is going to expose all the tiny cracks in peoples personalities.
So which 30 people would you choose to be trapped underground for 4 months with? Hmmm... thought not!

