Declassified: Untold Stories Of American Spies

Buried Secrets, Unbreakable Codes (3x6)

Air date: Nov 03, 2019

The FBI works alongside the NRO to stop a potential spy from selling classified secrets to an enemy nation. Soon they discover the spy, has buried the classified secrets all over the east coast and the only way to recover the stolen documents is to decipher a series of elaborate codes.