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

David Hogg named Nelson’s 2018 Citizen of the Year

Hogg has led the Kootenay Kiltie Pipe Band for 30 years

Two missing in Pend d’Oreille crash

A 15-year-old male and 18-year-old female both from Fruitvale are missing and presumed deceased

Judge: Nelson not liable for snowbank injury

A woman sued the city after injuring herself in 2015

Beaver Valley Nitehawks oust Nelson Leafs from playoffs

The Nitehawks eliminate number-1 division seed Nelson Leafs from playoffs with Game-6 victory

SIP Talks return to highlight dynamic Kootenay women

Seven women will speak about their experiences at this year’s event

Defiant vigil starts healing in New Zealand after massacre

Police say the gunman in the shooting that killed 50 acted alone

Temperature records dating back to 1947 broken in B.C.

The Squamish airport recorded the hottest temperature in the province (and Canada) on Sunday: 21.3 C

B.C. First Nations’ intake of essential nutrients could drop by 31%: study

Professors project the nutrient decrease by 2050 if climate change mitigation continues as is

Man enters unlocked B.C. home with knife, sexually assaults 22-year-old

Investigation ongoing after woman sexually assaulted in Greater Victoria early Sunday morning

Trudeau fills vacancy in cabinet with B.C. MP Joyce Murray

Murray, 64, was elected in 2008 and served previously as a minister in B.C.’s provincial government

Gunman kills 3 on Dutch tram; mayor says terror likely

Utrecht police release photo of 37-year-old man born in Turkey who is ‘associated with the incident’

Facebook announces changes to political advertising to meet new federal rules

Bill C-76 bans the use of money from foreign entities to conduct partisan campaigns

Travel expected to be slowed by fallout from fire at Toronto’s Pearson airport

All U.S.-bound flights from Terminal 1 were cancelled Sunday night after the fire broke out near a security checkpoint

Most Read