The "nice" elevator is right out of a luxury hotel with a smooth ride and room for 75 people. It has six degrees of safety redundancy, which means that if one cable were to snap, several others, plus an emergency brake or two, would prevent the six of us from hurtling to our deaths. But just as I'm adjusting the self-rescuer respirator on my utility belt, we get the news: There's a problem with the "nice" elevator. We have to take the salt shaft. The "other" elevator is really a glorified cage pulled along a single cable through a vertical salt shaft; it has one level of redundancy and ... Read More