Under the Rock Cities of the Underworld : Season 3 Episode 10
TV-PG Planète+ A&E 43m
Aired: January 12th, 2009 @ 7:00 PM EST on Planète+ A&E
Underground San Francisco is explored. Included: an ammunitions depot; a former repository for nuclear missiles; Civil War fortifications beneath Alcatraz; and tunnels below Chinatown.
