I would use an ice chipper (chisel) and 'thunk' my way along the ice. I'd pay attention to the looks and sounds of the ice and every so often I would chip through the ice to measure the thickness. I would make that first chip a gentle one and make sure you have a strap around your wrist and connected to the chipper. If it punches trough retreat! Just incase, make sure you have an extra pair of underwear.
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