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Passive acoustic monitoring was conducted in the Navy’s Southern California Range Complex from April 2016 to June 2017 to detect marine mammal and anthropogenic sounds. High-frequency Acoustic Recording Packages (HARPs) recorded sounds between 10 Hz and 100 kHz at three locations: west of San Clemente Island (1,000 m depth, site H), southwest of San Clemente Island (1200 m depth, site N), and west of La Jolla, California (500 m depth, site P). In addition, an array of 9 HARPs was deployed in the San Diego Trough, during the fall of 2017, to track baleen whale calls.