Despite the fact that in spy movies, heroes enter buildings through a duct system without any problems, this is extremely difficult in life. In practice, systems are rarely cleaned, if at all. Manual cleaning of pipelines requires huge costs and resources, and sometimes even partial dismantling of system elements and false ceilings. But the DucTT robot of an unusual design can now cope with this work. It consists of two interconnected tetrahedrons and is designed to clean pipes. All electronics, batteries and cables are located in tubular components. DucTT is able to dynamically change its shape and due to this move on the surface, turning on turns.