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

Local youngsters lend a helping hand to the Red Deer Hospital

First Steps and Beyond School students donate to Neonatal Intensive Care Unit

Red Deer RCMP arrest man during break and enter in progress

RCMP found two males in the parking garage attempting to steal a vehicle

Red Deer RCMP announce new Officer in Charge

Grobmeier has 26 years of service with the RCMP where he has moved through the ranks across Canada

CAT’s latest, Real Estate, fueled by strong performances

Shows run through to March 30th at the Black Knight Inn

Red Deer resident releases a set of inspiring new titles

Bev Burton excited to share her story via Create Your Calm Waters and Arise & Shine

Defiant vigil starts healing in New Zealand after massacre

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

Notley’s government puts priority on health care in throne speech

Lt.-Gov. Lois Mitchell kicked off the legislature session

NDP’s Jagmeet Singh steps into the House of Commons, making history

Burnaby South MP becomes first visible minority to lead a federal party in the House of Commons

B.C. argues it cannot stop Trans Mountain, but it can protect environment

Alberta Premier Rachel Notley says only Ottawa has the authority to decide what goes in trans-boundary pipelines

Privy Council clerk Michael Wernick retires in wake of SNC-Lavalin case

Jody Wilson-Raybould accused Wernick of pressuring her to head off criminal charges for the firm

Dutch tram shooting suspect arrested, say police

Police say three people were killed in the shooting Monday and five wounded

Canada extends Iraq and Ukraine military missions to 2021 and 2022

Extension is part of efforts to curb Russian aggression and to fight against Islamic militants

WestJet suspends 2019 financial guidance after Boeing 737 Max grounded

The company has 13 Boeing 737 Max 8 aircraft grounded by regulators after the Ethiopian crash

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

Most Read