To understand the need for 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 live naturally there and, in many cases, alien species have totally taken over for the life that originally was there. Alien species might be insects, mussels, fish, animals or plants. The cost of fighting these alien species was in the UK at 1,6 billion EUR (2013) and the cost is growing all around the world, every year. The biggest group of alien species are plants. Therefore, today’s practice is that soil that must be moved (because of construction, the building of road or railroad) are classified as polluted very often, even though the soil could be of top quality otherwise. Polluted soil is treated like garbage and taken out.