Project Description: Nautilus is a portable underwater drone that protects ocean ecosystems by real-time monitoring of water quality and removing microplastics. It has advanced sensors (ultrasonic, temperature, pressure, turbidity) that monitor water conditions, target areas being the Mediterranean Sea. Nautilus includes a filtration system with water pumps and UV light to clean water and eliminate pollutants, making fish breeding zones secure. It is controlled by Arduino Nano and Uno and uses DC motors for movement and a cooling fan for preventing overheating. It is made waterproof so it can operate underwater. It is an underwater solution, unlike surface solutions like Ocean Cleanup, where Nautilus can operate underwater, with real time monitoring, active filtration, and effective movement. This compact, low-cost project is scalable for ocean protection, solving space, power, and sensor issues with clever design. Its modular design allows adaptability, ensuring long-term reliability and greater environmental impact.