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As the cage hurtled down the shaft, the suspended weight increased. The cage by itself weighed 20,000 pounds, and a full load of men roughly doubled that. Then there was the weight of the steel rope that held the cage. The rope was 2.5 inches thick and weighed 12 pounds a foot. That meant that for every thousand feet we dropped, the rope added six tons to the weight it had to hold???an extra ton every 3.6 seconds. I pictured the steel rope unspooling in a blur, packing steel onto our plummeting car.