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This record describes the wildlife observations data from the Marine National Facility (MNF) RV Investigator voyage IN2022_V05, titled "The tsunamigenic submarine landslides and deep-marine canyons of Australia’s Tasman Sea margin: Causes and Consequences." The voyage took place between May 28, 2022 and July 3, 2022 (AEST), departing from Hobart and returning to Brisbane. This dataset documents marine mammal observations collected during seismic operations aboard. Three trained Marine Mammal Observers (MMOs) were stationed on the port and starboard wings of the bridge, with a third observer positioned at the aft bridge control centre, rotating through three-hour shifts. Observations were conducted continuously from pre-start through soft-start, full-power, and transit stages of the survey.