The ransomware attack crippling one of the world's top aluminum makers is exposing how crucial sophisticated digital systems have become in the centuries-old industry of turning mined rock into metal products.

Following a “severe” cyberattack on Norsk Hydro ASA's operations in the United States and Europe early on Tuesday, the company has been forced to shut down several automated product lines and is keeping its smelters running using manual production processes. Hydro said it's planning to restart certain systems on Wednesday to “allow for continued deliveries to customers.”

The critical issue for Hydro is to now find specific customer orders and the recipe for how to fulfill them, CFO Eivind Kallevik said in an interview in Oslo on Tuesday.

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