What technique does Perrault use to avoid falling into icy water?

In "The Call of the Wild," Perrault demonstrates a practical approach to navigating the treacherous icy conditions by using a long pole to test the ice before crossing. This technique is effective because it allows him to gauge the strength and stability of the ice ahead, helping to prevent any accidents that could occur if he were to walk on weak or thin ice. By probing with a pole, Perrault can assess whether the surface can support his weight and the weight of the sled team, thereby ensuring their safety in such a perilous environment. This method reflects the resourcefulness needed to survive in the wilderness, showcasing Perrault's understanding of the dangers and his ability to adapt to them.