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Servoindicator for a control rod in the Unit 4 control room, Chernobyl Nuclear Power Plant, measuring rod insertion depth from 0 to 8 meters. The reading is no longer meaningful. The descending main control rod in Channel 40-37 would have become stuck at about 2m before the core disintegrated.

Servoindicator for a control rod in the Unit 4 control room, Chernobyl Nuclear Power Plant