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The U1a Complex is an underground laboratory consisting of horizontal tunnels, each about one half mile in length, where experiments supporting the nation's nuclear stockpile are conducted. The U1a Complex is mined at the base of a vertical shaft approximately 960-feet below ground surface. The vertical shaft is equipped with a mechanical hoist for personnel and equipment access while another vertical shaft, about 1,000 feet away, provides cross ventilation, instrumentation and utility access, and emergency exits.