With a depth of up to 160 feet, the temperature inside the network of tunnels and chambers hovers between 68 and 72 degrees all year round, with humidity sitting at a comfortable 40 percent. Thanks to the miners’ use of an extraction technique called the “room and pillar method,” the enormous underground cavities left behind are supported by 16-foot pillars; the space is open, regular, and, expansive enough to accommodate nearly anything that can fit through its above-ground, drive-in entrance ramps. from Since the ’60s, Ford Has stored Cars Underground in a Kansas City Cave [Hagerty]
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