Long shafts, known by various sources in Sambia, were not attracting the attention of archaeologists. According to their location, the shafts are divided into: shafts near the extremities of the peninsula, known from archaeological exploration, and shafts in the depth of the land, known only from written sources. It is possible that the shafts were performed not so much by the military as by cult and administrative functions, limiting the extraterritorial nature of the canals and protecting the foreign boats roaming through them from the Prussian tribal territory, the laws of which the merchant-mariners did not obey.