Ever wondered how a fish net is strung between two holes in the ice to catch fish? What you can see here is a crawler. One hole is chopped/chipped into the ice and the crawler is lower in. Because it floats there is friction between the crawler's middle "arm" and the ice above. When gentle tugs are made on teeh blue rope connected to the crawler the "arm" rachets the crawler along. This is done until covering a distance equal to the size of the fish net. The cralwer must then be located. On a day like the one shown where the high winds (-27 with wind chill)has blown the snow away it is fairly easy. When there is snow, you must dig down to look, or listen to hear the racheting. When located, a second hole in dug in the ice to retreive the other end of the rope in order to string the net. Here Nate, Ben and Mark (a Canadian Ranger from the Resolute Patrol) dig to retrive the crawler from under the ice.