Surveyors in California earned the most in 2011, reporting an average annual salary of $82,370. Nevada ranked second at $73,180 per year, followed by Alaska at $73,100, Massachusetts at $70,920 and Delaware at $70,360.
The interior of SubTropolis. SubTropolis is a 55,000,000 square foot (5,060,000 mÂ³), 1,100-acre (4.5 km 2) manmade cave in the bluffs above the Missouri River in Kansas City, Missouri, United States, that is claimed to be the world's largest underground storage facility.he complex contains almost seven miles (11 km) of illuminated, paved roads and several miles of railroad track. Currently 5,000,000 square feet (460,000 mÂ³) is occupied and 10,000,000 square feet (920,000 mÂ³) are improved..
The U.S. Postal Service uses Subtropolis as a distribution hub for postage stamps, storing hundreds of millions of stamps in the facility. The USPS rents more than 500,000 square feet at SubTropolis.ore than 1,000 people spend their workdays in SubTropolis, an industrial park housed in an excavated mine the size of 140 football fields. Patrick Clark pat_clark.