https://www.naval-technology.com/projects/echoclasssurveyvesse/
Echo Class Hydrographic / Oceanographic Survey Vessels - Naval Technology
oceanographic survey vessels
https://www.naval-technology.com/projects/project-11982-class-oceanographic-survey-vessels/
Project 11982 Class Oceanographic Survey Vessels, Russia
Apr 12, 2022 - Three Project 11982-class oceanographic survey vessels are in service with the Russian Navy to conduct research activities in deep waters.
oceanographic survey vessels