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One of the most unique military facilities in the previous Canal Zone was the Joint Operations Tunnel located at Quarry Heights. In March 1940, Lieutenant General Daniel Van Voorhis, Commanding General of the Panama Canal Department, directed the construction of a bombproof shelter at Quarry Heights based on the necessity for use in case of emergency and vital to the security of important data. The Joint Command Post facility, completed by January 1942, was constructed under 200 feet of native porphyry rock, with the entrance cut into the solid rock face of the old Ancon Quarry, and was built of reinforced concrete at a cost of $400,000. The structure featured a 269-foot by 52-foot main building and a 302-foot by 7½ -foot tunnel. The facility had since been used as a secure intelligence, communications, and joint operations command post center for the unified command through 1997.