Nowadays Unmanned Amphibious Vehicles [UAVs] are employed in many applications such as oceanic research, deep sea exploration, mapping, naval surveillance, and disaster monitoring and fisheries protection. The use of UAVs in military and other applications has steadily increased over the few years. On the other hand, there has been a tremendous increase in ocean exploitation. Though technologies are increasing incrementally, nature is exploited adversely. Advancement in ocean transportation, shipping, sewage wastes filled the ocean with tonnes and tonnes of debris and oil wastes. This ravage fills affect the complete marine ecosystem. This in turn makes the ocean toxic. Advancements have been made in recent years to clean up the oil spills. The noted projects such as Sea bin, super high-tech sponges etc. All these innovations are the static one which cannot move along the waves of the ocean. The static form of these inventions could not be used to clean to the larger extent. Therefore, this study aims to build an UAV which is a movable one, can detect the debris and clean those by incorporating existing cleaning techniques. Since the UAV has to sub merge under the water to some extent, it should be designed in such a way by considering both the hydro-dynamical and hydro structural aspects of it. The unique point in the paper covers the flexible cum efficient design of the UAV. The design of the tropical bird is chosen for the efficient model of the UAV. With the few known parameters of this species, the UAV has been designed to achieve the maximum efficiency. The tropical bird chosen has the higher rate of climb, which is the desired requirement for this study. The propeller is uniquely designed based on aerodynamic cum hydrodynamic data so as to balance both the effects. With the design data estimated using analytical formulae, the UAV has been constructed. Following the design, the complete analyses on aerodynamic, aero-structural, hydrodynamic and hydro structural computations are completed. Finally, the employment techniques such as ravage removal mechanism, integrated rotor for the selected application will be integrated. CATIA and ANSYS Workbench are the major tools involved in these comparative investigations, in which modelling of UAV is computed in CATIA and fluid pressure, structural deformations, stresses on UAV are computed through ANSYS Workbench.