The Malinta Tunnel housed the command center on Corregidor Island once the Japanese began attacking the Philippines as seen May 10, 2017. Originally built in 1932 the famous Malinta Tunnel was constructed by 1,000 Philippine convicts from Bilibid Prison in Manila and a company of engineers from the Philippine Scouts working as foremen and clerks under the supervision of the Army Corps of Engineers, This was done using rented obsolete gold mine equipment and derelict TNT as Congress failed to appropriate money for the work. The name malinta means plenty of leeches in Tagolog, found during the construction. Ironically, the cement for the concrete used was bought from the Japanese. (U.S. Coast Guard photo by Chief Petty Officer Sara Muir/Released)