Sliding on undetected thin ice is extremely dangerous behavior, and it is strongly recommended not to try it. The thickness and strength of ice cannot be accurately judged by the naked eye, especially in the case of large temperature changes, the ice may be very fragile. Here are some safety suggestions to help you avoid danger： 1. **Avoid Undetected ice**: Do not glide on ice that has not been professionally tested or has no clear safety signs. Even if the ice surface looks strong, there may be weak areas. 2. **Understand the thickness of the ice**: A safe ice thickness needs to be at least 10 cm or more to support a person's weight. For skating or skiing, the thickness of the ice should reach more than 15 cm. Please keep in mind that these data are for reference only, and the actual situation may vary due to weather, water quality and other factors. 3. **Observe the ice surface**: If there are cracks, air bubbles, water currents, or color changes (such as gray or darkening) on the ice, this may mean that the ice is weak and dangerous. 4. **Walk together**: If you have to move on the ice, be sure to walk together and make sure someone knows your whereabouts. Carry life-saving equipment, such as crampons, life-saving ropes or buoyancy devices. 5. **Learn self-rescue skills**: If you accidentally fall into an ice cave, try to stay calm, try to hold the ice with both hands, and slowly pull your body out of the water. Avoid standing upright, but try to lie flat on the ice as much as possible, spread your weight, and slowly climb to a safe area. 6. **Wear appropriate equipment**: Wear warm and waterproof clothing, and bring necessary safety equipment such as ice picks, life-saving ropes and whistles. In short, safety always comes first. If you have any questions about the safety of the ice surface, please avoid taking risks. Choose a safe ice surface that has been tested and certified for activities, or choose other safer winter sports methods.