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Hanginon t1_izzw8ro wrote on December 13, 2022 at 1:46 AM

Reply to comment by Munchma_Koochey in How does putting glass underwater, prevent it from breaking when drilling/cutting? by emelrad12

This is absolutely the reason, thermal shock happens when glass is heated and expands unevenly and can be prevented with a flow of coolant across the area and the tool generating the heat.