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Industrial activities, rapid industrialization, uncontrolled population growth, and climate change have led to a significant increase in the amount of toxic waste discharged into water resources. Consequently, monitoring water pollution has become a critical necessity to ensure the sustainability of aquatic ecosystems and public health. Traditional monitoring methods currently in use, such as manual sampling by divers and fixed-station systems, generally fall short due to depth limitations, high operational costs, severe safety risks, and a lack of continuous spatial data. This project aims to overcome these operational, technical, and economic barriers. To this end, an innovative, multi-purpose Remotely Operated Underwater Vehicle (ROV) with a modular architecture has been designed and developed to perform observation, measurement, and sampling tasks in both…