BBC - US and Canada

You are grossly overestimating much of this capability I assure you. As a contractor under NNSA (though not working directly with the offices these folks would have worked in) a few things I am very confident in: they all had work issued cell phones, the majority did not have a personal cell phone, and the emergency contact info was likely out of date since it would be on the employee usually to update it, and who actively goes into the HR system to update info like that when you've worked somewhere for 15 years?

I'm sure some are also just actively ignoring attempts to contact them, I know I would in this situation.