In this July 7, 2011, file photo, Jim Breeden of the Golden Gate National Parks Conservancy, walks through the dungeons below the main cell house during a night tour on Alcatraz Island in San Francisco. (AP Photo/Eric Risberg, File)

Hidden tunnels found below Alcatraz prison

Archaeologists find buildings and tunnels under prison yard at famed San Francisco pen

Archaeologists confirmed a long-time suspicion of historians and say that famed Alcatraz prison was built over a Civil War-era military fortification.

Researchers found a series of buildings and tunnels under the prison yard of Alcatraz Federal Penitentiary, which once held Al Capone, SFGate reported Tuesday.

A study published last week in “Near Surface Geophysics” said archaeologists used ground-penetrating radar and terrestrial laser scans and historical maps and photographs. They found fully buried structures, ammunition magazines and tunnels.

“This really changes the picture of things,” study author Timothy de Smet, an archaeologist at Binghampton University, told PBS. “They weren’t erased from the island — they are right beneath your feet.”

Archaeologists are now planning more study to discover what else lies just below the surface.

READ MORE: B.C. bolsters protections of heritage, archeological sites

Historians believe workers built over existing structures when the prison was built in the 20th century.

Alcatraz first came to the attention of the U.S. government after it took control of California from Mexico in the 1840s. Its location in San Francisco Bay made it attractive for military fortification purposes.

During the Civil War, Fort Alcatraz was the official military prison for the West Coast.

In the 1930s, the first federal prisoners — deemed by the media to be the worst of the worst — began arriving. The last inmate left in 1963.

The Associated Press

Like us on Facebook and follow us on Twitter

Just Posted

Wetaskiwin man allegedly flees police, faces numerous charges

Wetaskiwin RCMP and Camrose Police Service make arrests following alert from Edmonton Police Service

Camrose and Wetaskiwin RCMP Detachments roll out new policing model

A review of Wetaskiwin-Camrose project reveals that it has been successful in several areas

Wetaskiwin reaches the 20th century

Anthony Rosenroll elected to North West Territories legislature in 1898

Request for speed drop near Greystones denied by county

County of Wetaskiwin hears request to drop RR#61 speed limit

What’s wrong with populism?

Political parties are supposed to listen to us, not vice versa

Raptors Bling: NBA champions receive their rings in pre-game ceremony

There are over 650 diamonds — at a weight of 14 carats — in the 14-karat yellow gold ring

Mounties charge four people after protest at Alberta turkey farm

Three adults and 16-year-old girl charged with break and enter to commit mischief

15 Canadian youths to sue Ottawa for not acting on climate change

They say young people will be more affected than other groups

Alberta’s oilsands carbon liability at centre of closely watched New York fraud lawsuit

Exxon Mobil accused of misrepresenting the risks the operations face as governments move to fight climate change

‘Havoc and chaos:’ Alberta separatist group gains support as Liberals re-elected

The idea is getting interest from people in Saskatchewan, Manitoba and parts of British Columbia

In the news: Wexit, Brexit and Trump sparks outrage

There’s been a surge of support for an Alberta separatist group

Alberta man admits to killing sometimes girlfriend; reported death to police

Clifton James Spotted Eagle was charged with second-degree murder

Rebels extend losing streak to 5 against ‘Canes

4-3 loss comes after a disappointing 6-5 S/O loss on Saturday

Most Read