Underwater drones can quickly dive and rise to the surface, as well as operate indefinitely. In the past, divers had to work in difficult underwater conditions, including low visibility conditions. Divers can only be underwater for a limited time, and in case of any problems, they must be replaced by others. Now, rescuers conduct a preliminary inspection with ROVs, and divers go into the water only when it is really necessary. This significantly saves time and effort, and also increases the safety of the work of rescuers.