Our most outlandish equipment consisted of a measuring device that had been issued to each of us, which hung from a strap on our belts: a small rectangle of black metal with a glass-covered hole in the middle. If the hole glowed red, we had thirty minutes to remove ourselves to “a safe place.” We were not told what the device measured or why we should be afraid should it glow red. After the first few hours, I had grown so used to it that I hadn’t looked at it again.
