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In February 2020, a passive acoustic monitoring (PAM) survey using Autonomous Underwater Vehicles (AUVs, aka “gliders”) was performed off Southern California using two Seagliders™ equipped with Passive Miniature Acoustic Recorder (PMAR)-XL acoustic processing boards, manufactured by Hydroid, Inc. (formerly a subsidiary of Kongsberg Marine, now a subsidiary of Huntington Ingalls Industries).