There will be cave cities

Philip B. Bucky : professor
'In 1934, Professor Philip B. Bucky of Columbia University proposed adapting the design of mine shafts for creating an underground city capable of withstanding "the crushing load of thousands of feet of earth and rock." While we're skeptical of life without sunlight and Vitamin D, people back then anticipated year-round climates made possible by airconditioning and artifical light.'