Just what Makarovia needs! I’m sure with the large Gay population there, they can turn caverns, both natural and artificial, into showplaces, like the Dwarf Kingdoms in Middle Earth before the Balrog. With LEDS, artificial light can be tuned to closely mirror natural sunlight. With clever design, you might not even realize you were deep underground. The caves might not be everybody’s first choice for housing, but they’d work well for retail, entertainment, offices, and even some forms of sports – Reric Theater multiplexes are a natural! ;–)