The case was in the summer on one of the numerous turbines.We went with a friend to fishing, and he had a dirt with a sliding float.Who is not in the theme-sliding float differs from the usual in that the float is attached not to the nipple, but freely slides on the slide, and the depth is displayed by a limiter on the slide.Put a friend a depth of 3-4 meters and awaits when the float will rise.Rise up and a friend as a boat:"STOP!