Expedition SO268 was part of the JPI Oceans project MiningImpact to assess the environmental impacts of deep sea mining of polymetallic nodules in the Clarion Clipperton Zone (CCZ). A sediment plume monitoring operation was conducted as part of this expedition. This plume was created by a dredge on 11 April 2019 between 6:30 to 19:00 UTC. Monitoring of the baseline conditions, active plume and post-disturbance effects was achieved by a sensor array of optical and acoustical sensors on platforms spread out around the plume creation site. This dataset contains (calibrated) acoustical sensor measurements of this plume array acquired by 6 different sensors.

Deployed during ROV event SO268-2_ST111-ROV16: ADV (GMR_HYA-08) mounted on platform GMR_PFM-07. 300 kHz ADCP (GMR_HYA-02) mounted on platform GMR_PFM-09. 300 kHz ADCP (GMR_HYA-03) mounted on platform GMR_PFM-10. Deployed during ROV event SO268-2_ST118-ROV17: ADV (GMR_HYA-09) mounted on platform GMR_PFM-08. AQD (GMR_HYA-06) mounted on platform NIOZ_PFM-07. AQD (GMR_HYA-07) mounted on platform NIOZ_PFM-08.