Word: tycho
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Dates: during 1950-1959
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...pioneers should be to look for natural caves or volcanic shafts that could be filled with imported air and made habitable. If such caves are lacking, a good place to found a city would be the "Straight Wall," a vertical cliff 500 ft. high to the lunar north of Tycho crater. Tunnels could be cut into its face more easily than they could be sunk from the surface. They should run about 50 or 60 ft. below the ground. At this depth their atmosphere, exerting an upward pressure of 1,440 Ibs. per sq. ft., would balance the weight...