Ben was locked up in the armory when the lockdown was initiated. Desmond knew the trick from Kelvin teaching him using those faulty wires in the electrical box. I'm getting the feeling that Ben has little knowledge of what the heck that place was about. The only reason I say that is because him and mostly every one else is reffering to when the hatch imploded as an "electromagnetic anamoly". They aren't putting the pieces together and didn't say "Oh they must of not pushed the button over at the Swan. You see where i'm getting at guys?

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"You Don't Even Know What Your Running From!"-Jack