To understand the need of our stationary machine you have to know about alien species. Alien species are species that occur outside their natural range and dispersal potential. Alien species are spread by human activity, intended or unintended, to new areas. This might have a dramatic impact on the species that already lives naturally there and, in many cases, alien species has totally taken over for the life that originally was there. Aliens species might be insects, mussels, fish, animals or plants. The cost of fighting these ailien species was in UK 1,6 billion EUR (2013) and the cost is growing all around the world, every year. The biggest group of ailien species are plants. Therefore, todays practice is that soil that must be moved (because of construction, building of road or railroad) are classified as polluted very often, even though the soil could be of top quality otherwise. Polluted soil are treated as garbage and taken out.