WHAT IS SUBTROPOLIS?
SubTropolis was created through the mining of a 270-million-year-old limestone deposit. In the mining process, limestone is removed by the room and pillar method, leaving 25-foot square pillars that are on 65-foot centers and 40 feet apart.
SUBTROPOLIS FACTS:
- over 10,000 stone pillars
- strength of limestone is 10,000 to 12,000 pounds per square inch, which is 3x stronger than concrete
- 1.5 million tons of rock are mined every year (35 acres per year)
- nearly 45 million square feet (over 1,000 acres) have been mined out since mining began in 1945
Want more info? SubTropolis Storage Flyer
SUBTROPOLIS STORAGE NOW TAKING WINTER 2010 RESERVATIONS!
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