. >> reporter: bengie buffalo is one of them, his white tent now a canvas. >> i should turn them in for graffiti. >> reporter: where people in this camp are leaving their personal mark. >> people all over the world. i figure from now on, all these prayers are with us. >> reporter: foyer goal is to stop destruction of the final piece of the dakota access pipeline. >> i have children, also. so i don't want them to feel the repercussions of decisions that we've made. >> reporter: the $3.7 billion pipeline need a pending permit from the army corps of engineers to drill under the lake, part of the missouri river watershed and the main source of drinking water for the standing reservation. stopping the pipeline is the long term goal of the protesters. in the short term winter is coming. >> challenges are coming, the weather and wind and it's going to get cold soon. >> reporter: which is why temporary structures are going up at the camp and chopping firewood is a constant here. >> so we're here as people, not just natives but for all human beings. >> reporter: a unity that bengie buffalo says

. >> reporter: bengie buffalo is one of them, his white tent now a canvas. >> i should turn them in for graffiti. >> reporter: where people in this camp are leaving their personal mark. >> people all over the world. i figure from now on, all these