Shutting down a blast furnace in such a fashion that it can be restarted at a later point involves removing the liquid and solidified materials in the hearth of the furnace below the tap hole. This part of the furnace is called Sau (=sow) in German, le loup (=wolf) in French or salamander in English. Its liquid part gets tapped using a drill and an oxygen lance.
Hebig also has a clip of a roiling steam cloud enveloping the factory as they cooled the furnace shell.
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