Why are these people drilling holes in the ice? Actually, this is called ice thickness testing. You see, ice skating on natural bodies of water can be very dangerous if the ice is too thin, so measuring its thickness is crucial to prevent accidents. While some people use a rock drop test, it's safer to use an ice screw. You know it's fully inserted when you feel less resistance. The general rule of thumb is that you need at least 4 inches before it can support you.

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