Very few start the descent and even fewer return, but those few that do tell of the riches and dangers alike.
...
It was throwing your life away as far as I was concerned too many colleagues and friends had been lost to the promise of wealth. But that's not why I ventured down. I had no choice. I was a criminal.
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The people willing to descend had been declining over the years as less came back. And the few that remained were evidently not enough. They needed a new source of divers.
The government just couldn't afford to import the large quantity's of crystals. Yes, the crystals. Battery's to the people above. It created an era of cheap, abundant electricity and a massive over reliance on them. Skyrocketing demand wiped the top floors clean. Without enough crystals production to be sustainable we descended deeper. Then the trouble began, then they became known as dungeons.