Underwater drone for cleaning and inspecting hulls. The Keelcrab is the first of a new generation of underwater drones devised and manufactured in Italy that performs automated cleaning and hull inspection operations. It is characterized by an exoskeleton in plastic material with neutral hydrostatic balance. The drone remains attached to the hull thanks to the vacuum/aspiration force, removing any algae or typical vegetation that grows on the hull during long periods of rest in enclosed harbours.