Overview:
Some strongholds are built to defend a nation, others to survive its darkest hour. From deception to survival to espionage, these hidden sites reveal the lengths nations go to when the stakes couldn't be higher.
Release Date : 2026-07-23
Genre : Documentary
Duration : 42 menit
Rating : ⭐ 8.5/10 (2 votes)
Actors : David Duchovny