Secret City of WWI

Smithsonian Channel

Thursday 30 January 2020  22:00 - 23:00 (60 mins)
The discovery of an underground city in Northern France, where World War I soldiers took refuge. A historian and photographer attempts to connect the names to their descendants.

Secret City of WWI may be available on Prime Video (affiliate link)
Secret City of WWI (Smithsonian Channel) Thursday 30 January 2020 22:00 - 23:00