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Passive acoustic monitoring was conducted in the Navy’s Southern California Range Complex from July 2018 to May 2019 to detect marine mammal and anthropogenic sounds. High-frequency Acoustic Recording Packages (HARPs) recorded sounds between 10 Hz and 100 kHz at three locations: two west of San Clemente Island (1,300 m depth, site E and 1,000 m depth, site H) and one southwest of San Clemente Island (1,250 m depth, site N).