The researchers studied how to keep high-temperature mines cooler by insulating the rock around the tunnels. They found that thicker insulation layers help keep the heat in better, but there's a limit to how much it helps. The type of material used for insulation and the size of the tunnel also affect how well it works. The thickness and material of the insulation are more important than the tunnel size for keeping the heat out. This information can help make mines safer by preventing overheating.