I've been in that situation, close to closing time. I was alone, many stories down in the depths of the complex, when without warning the lights went out. I've

I've been in that situation, close to closing time. I was alone, many stories down in the depths of the complex, when without warning the lights went out. I've never experienced such utter, black-out darkness. I was instantly paralysed with fear. The lights came on again after too many seconds of blackness, and I dashed out into daylight as fast as I could. I had to pause several times on the way out while the attendant switched off the lights a few more times. If you ever get a chance to visit, do so - there are several underground cities in the region, all slightly different. They're fascinating.