I recently read an article on a UK navy ship on a mission of seafloor mapping (https://www.theregister.co.uk/2018/11/21/hms_enterprise_royal_navy_survey_ship_ro

I recently read an article on a UK navy ship on a mission of seafloor mapping (https://www.theregister.co.uk/2018/11/21/hms_enterprise_royal_navy_survey_ship_role/ https://www.theregister.co.uk/2018/11/21/hms_enterprise_roya...) and apparently they still make sure that there's no wildlife nearby. "with the sonar switched on, having first ensured no marine wildlife is nearby that would be distressed by the sonar"