[LordHog]

From the article, Cmdr. Bill Speaks, a Navy spokesman, said, “There are measures in place that require companies to notify the government when a ‘cyber incident’ has occurred that has actual or potential adverse effects on their networks that contain controlled unclassified information.”

This does not indicate the data was or was not classified. Now, at the beginning of the article, "The data stolen was of a highly sensitive nature despite being housed on the contractor’s unclassified network. The officials said the material, when aggregated, could be considered classified, a fact that raises concerns about the Navy’s ability to oversee contractors tasked with developing ­cutting-edge weapons."

The article suggest the data, in aggregated form, could be viewed as classified. I am quite sure not all the details have been made public nor will they be for some time. I am sure it will take many years for that true nature of the breach to enter public domain. Submarines are the US primary means of nuclear deterrence and any breach to limit that deterrence might be considered harmful.