To anyone who thinks they will live on Mars in a structure like MARSHA or any other small surface structure...First I'd ask you how much you liked staying indoors for the last year and ask you how you'd like to do that for the rest of your life. Next I'd suggest get yourself a really authentic looking spacesuit costume and wear it anytime you leave your house, but don't just put it on, you need to take at least 45 minutes to put it on or take it off. Before donning the suit thoroughly inspect ever seem ever stitch to make sure there are absolutely no flaws. When you take it off you'll need to reinspect, clean and repair any flaw you find before carefully storing the suit for it's next use. While out side your home you cannot take the suit off for any reason, cannot eat or drink. You can urinate or defecate if you don't mind doing it in the diaper you are wearing.
This is what Bezos meant when he called Everest a paradise compared to Mars. A spacesuit is for all intents is a miniature habitat separate from the environment it protects you from. Though you could not survive long on top of Everest. You can stand on it summit touch the snow and stone, breath the air. Look out to a living breathing world. Which is something you will never ever do on the surface of mars.
The lava tubes of mars are kilometers high and wide, as many as hundreds of kilometers long. Whole cities could be constructed in them. Cities protected from the cold, radioactive, toxic, vacuum that is the surface of Mars. In the lava tubes million of people could live and work like human beings. Leaving their homes whenever they like to enjoy massive parks and green spaces so large you would have no sense you are not out side because the ceiling of the habitat is kilometers above your head.
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