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Garo Nalbandian
Sinkholes constitute some of the best evidence that the Warren’s Shaft system and Hezekiah’s tunnel began as a karst system. In addition to the sinkholes that form Warren’s Shaft, the “dead-end” shaft, and the entrance to Gihon Spring, a sinkhole also interrupts the ceiling of Hezekiah’s tunnel. This sinkhole ascends about 6.5 feet, after which it is blocked.