Underground Places

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Mud flood at Kirby Cove	Cavallo-tunnel.jpg	Mary Slater inside the channel	Interior of sea cave, looking east from opening
1870s fortificaiton tunnel, Presidio of San Francisco. This chamber hadn't been opened for 70 years.	Ft Barry, Bonita Hill - Tunnel to fire control stations	Spelunkers inside Battery Townsley. NPS historian Steve Haller with jaunty eyepatch	Marin Headlands air vents
Btry Townsley antiaircraft gun shelter-entry	Btry Townsley AA gun shelter interior	Btry Marcus Miller magazine doors	Ft Scott - 1870s West Battery magazine
Btry Godfrey - West Battery magazine; lantern niches	Btry Marcus Miller magazine interior	Ft Scott - West Battery replica door	Battery Cavallo tunnel & GG Bridge
Fort Baker -Battery Cavallo tunnel interior	Fort Baker -Battery Cavallo tunnel portal	Angel Island, Battery Drew	Stenciled warning
Stockton Street tunnel	Speaking tubes	Btry Townsley doors	Alcatraz -Cistern spelunking
Alcatraz sewer 1	Alcatraz sewer 2	Fort Scott - West Battery magazine doorway	Air ventilation tube, West Battery
Lost gull	Alcatraz cistern detail	Alcatraz cistern detail 2

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