Exceptionally grave damage is the level of damage to national security can you reasonably expect top secret information to cause if disclosed.
When it is conceivable that information's unauthorized exposure could result in exceptionally severe harm to the country's security, it may be given the "Top Secret" classification. The strictest caution should be exercised while applying this classification.
Armed hostilities against the United States or its allies, a breakdown in international relations that has a significant impact on national security, the compromise of crucial national defense plans or sophisticated cryptologic and communications intelligence systems, the disclosure of sensitive intelligence operations, or the disclosure of scientific or technological advancements that have a significant impact on national security are examples of "exceptionally grave damage."
The level of harm to national security that can be expected from the disclosure of top-secret material is exceptionally grave damage.
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