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

Indigenous youth connect with their culture at Gathering Our Voices workshops

Secluded Wellness Centre in Port Alberni hosted traditional wildcraft sessions

Illegal cannabis club in Port Alberni ticketed again

RCMP seize cannabis, issue fine for second time in five months

Motorists attempted CPR on victim in fatal Highway 4 crash west of Whiskey Creek

Witnesses say three vehicles involved in collision; man in 70s confirmed dead

Chef returns to North Island College to inspire young cooks

Tina Tang shares her culinary journey since graduating

Real-life tsunami threat in Port Alberni prompts evacuation updates

UBC study says some people didn’t recognize the emergency signal

Port Alberni Fire Department engages Indigenous youth in fire awareness

Workshop took place as part of Gathering Our Voices event in Port Alberni

Calgary captain has 3 points as Flames torch Canucks 3-1

Giordano leads way as Alberta side cracks 100-point plateau

Fire crews battle large blaze at Courtenay hostel

Courtenay Fire Chief Don Bardonnex said nobody was injured

1,300 cruise ship passengers rescued by helicopter amid storm off Norway’s coast

Rescue teams with helicopters and boats were sent to evacuate the cruise ship under extremely difficult circumstances

B.C. university to offer first graduate program on mindfulness in Canada

University of the Fraser Valley says the mostly-online program focuses on self-care and well being

Province announces $18.6 million for B.C. Search and Rescue

The funding, spread over three years, to pay for operations, equipment, and training

Late-season wave of the flu makes its round in B.C.

BC Centre for Disease Control reported 50 per cent jump in flu cases in first weeks of March

Tofino’s housing crisis causing some to seek shelter at the local hospital

Tofino’s housing crisis is pushing the town’s ‘hidden homeless’ population into the forefront.

Sentencing judge in Broncos crash calls for carnage on highways to end

Judge Inez Cardinal sentenced Jaskirat Singh Sidhu to eight years

Most Read