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Electromechanical cable-suspended drilling technology is considered one of the most feasible methods for subglacial bedrock drilling.The outstanding feature of this technology is that the bit load produced by the drill weight is usually within the range 1.0-4.0kN while the recommended load for diamond drilling is 10-30kN or even more.Therefore,searching for the diamond bits that can drill in extremely hard formations with minimal load and acceptable rates of penetration and torque is the necessary step to prove the feasibility of electromechanical subglacial drilling technology.