The Incredible Discovery Of The Military Fortress Under Alcatraz

Scott Croker | November 24, 2022 6:51 am

In the middle of the San Francisco Bay, the most well-known prison in the nation, is a now-defunct institution. The decommissioned prison is home to facility tours during the day and ghost-hunting tours at night. Thanks to archaeologists from Binghamton University, another mystery has been revealed. Laser technology was used to explore the ground beneath the prison's exercise yard. What they found could alter the way we look at Alcatraz forever.

Original Owner

Alcatraz Island...
Jane Tyska/Digital First Media/East Bay Times via Getty Images
Jane Tyska/Digital First Media/East Bay Times via Getty Images

Before becoming a world-famous penitentiary, Alcatraz Island was owned by Julian Workman. He was a ranch owner in 1846 when Alta California governor Pio Pico gave him the island. As part of their arrangement, Workman agreed to build a lighthouse.

Workman was never able to follow through on his promise. It's not that he couldn't, it's that he was never given a chance. Less than one year into his ownership, California's military governor John C. Fremont bought Alcatraz for $5,000.

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Handed Over To The Military

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In 1850, two years after California was sold to the United States, President Millard Fillmore ordered that Alcatraz Island be handed over to the military. This act turned the island into a military base, where it could be used as a defense to protect the bay.

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The rightful owner of the land, John C. Fremont, expected the United States to pay him a hefty fee for the island. His investment was about to pay huge dividends. Or was it?

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The Fight That Failed

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The United States took the land from Fremont, arguing that the deal to buy the island was invalid. Fremont lost the land, and he was given nothing in exchange.

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Fremont began a long legal battle seeking any sort of compensation. Along with his fellow ranchers, he fought the ruling in a case that ran through the system until the 1890s. In the end, it was declared that Fremont had no right to the land.

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"Island of the Pelicans" Is A Translation Of Alcatraz

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Vintage souvenir postcard, Alcatraz, San Francisco, California, ca 1947
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Let's travel back to 1775 when Alcatraz Island was first given the name we know it by today. Spaniard Juan Manuel de Ayala, who claimed to "discover" the island, called it "La Isla de los Alcatraces." This translates to "Island of the Pelicans."

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The island is 22 acres with two high points, one 135 feet above sea level and the other 138 feet. It is between these high points that Alcatraz Penitentiary can be seen from shore.

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A Three-Year Wait

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With Alcatraz Island firmly in the grasp of the United States, it took another three years for anything to happen. In 1853, construction finally began on a new fort under the watch of Zealous B. Tower.

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Although it took a few years for construction to begin, once it did, the building process needed to be fast. In 1848 the Gold Rush began, and people were flocking to San Francisco in the thousands! In just a few years, the population boomed from 300 to 30,000.

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Defending The Bay

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With so many people coming in so fast, building a defensive stronghold was a major priority. Not only did the military plan to fortify Alcatraz, but they also intended to build a stronghold on Fort Point, a nearby island.

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The Alcatraz project was finished first, which was a good thing. It wound up being given the strongest fortifications. At the time, no one knew it would eventually become one of the world's most notorious prisons.

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The Perfect Location

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As if blessed from above, the San Francisco Bay gave away the perfect island to build a defensive stronghold on. Engineers couldn't believe their incredible luck. In 1852, the Pacific Coast Board of Engineers reported:

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"Nature seems to have provided a redoubt for this [military] purpose in the shape of Alcatraz Island. Situated abreast the entrance directly in the middle of the inner harbor, it covers with its fire the whole of the interior space lying between Angel Island to the north, San Francisco to the south and the outer batteries to the west."

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Using What Nature Provided

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Tasked with building Fort Alcatraz as quickly as possible, Zealous B. Tower used what nature gave him. With his men, the crew took rocks from the island to build up the walls of the fort along its coast.

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Once the walls were placed, weapons could be positioned behind them around the island perimeter. These weapons were placed on the west, south, and north of the naturally-built walls. There were also 111 armed cannons on the island, making it ready for anything.

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Armed To The Teeth

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the citadel next to the lighthouse at alcatraz island
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As if cannons, which were called columbiads, weren't enough, Fort Alcatraz was also outfitted with caponiers, stone towers that projected from the shore. Anyone looking to take control of Fort Alcatraz would have been met with a degree of difficulty unmatched at the time.

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One year after construction began, the citadel was finished. There were barracks located next to the fort's lighthouse. The lighthouse was also the first navigational light ever placed on the Pacific Coast of the United States.

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Defending The Lighthouse

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the lighthouse could be defended from inside the citadel
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The citadel was tasked with not only defending the island but defending the lighthouse as well. To ensure success against attack, it was built to accommodate 100 soldiers, and expand to 200 when needed. The windows of the barracks were designed for soldiers to fire through.

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And if the fort was taken over, there were enough supplies in the citadel for those trapped inside to survive for four months. In that time, it can be assumed, backup would arrive, or the citadel would be breached and overtaken.

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An Opportunity Never Used

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During the Civil War, 350 men were positioned at Fort Alcatraz. Their time there ended up being unproductive. The fort was never attacked during the war. There was one recorded plot by the Confederate army, but the assault never came.

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In 1863, three men were detained and arrested in the plot to assault Fort Alcatraz. They were sentenced to ten years in prison - sentences they did not serve. Abraham Lincoln pardoned all three men when the war ended.

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The End Of The Process

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Although it was intended to be a quick process, the fortification of Alcatraz Island was not finished until 1859. There were many reasons that led to this, but the biggest one was a shortage of skilled labor workers.

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At the time the fort was being built, people were flocking to San Francisco in droves, but not to build a fort. They wanted to find gold and get rich quick. This meant finding people to actually work on the island was much easier said than actually done.

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The First Prisoners

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In modern times, of course, Alcatraz Island is best known for its penitentiary, and less for its military background. Interestingly enough, the two histories overlap. The first prisoners at Alcatraz were incarcerated soldiers in 1859.

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During the Civil War, the stronghold was also used to imprison Confederate soldiers. Even though Fort Alcatraz wasn't built to be a prison, the future of the island was clearly never in doubt. It was only a matter of time before that future became the present.

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The "Perfect" Prison

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Alcatraz Penitentiary first began holding civilian prisoners in 1934. Thanks to the topography of the island and its distance from the shore, it was the perfect place for a prison. Anyone who tried to escape would find that freedom outside the walls was impossible to come by.

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The waters surrounding Alcatraz are near freezing and the strong currents are backbreaking to swim against. Overall, there have been 14 escape attempts from the prison. No one involved successfully made it to the mainland.

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A Soaring Population

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Before holding civilian prisoners, Alcatraz held prisoners of war. In 1867, a jailhouse was built on the fort. Thirty years later, during the Spanish-American War of 1898, the prison had a population of 450.

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Over the next 15 years, the prison expanded with the addition of large concrete prison cells. That block of cells is the largest structure still intact on the island. Finally, in 1933, the military portion of the fort was decommissioned and the entire operation was handed over to the Prisons Bureau.

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James A. Johnston Was A Tough Warden

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Alcatraz Penitentiary welcomed its first group of prisoners on August 11, 1934. This group was "special" and had been hand-picked by authorities to make the journey to the island. They had disrupted life at their previous penitentiaries and needed a change of location.

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Watching over these men was Alcatraz's first warden, James A. Johnston. He was known as a strict disciplinarian and was the perfect man for the job. Life wouldn't be easy for him, but he had a crew of 155 guards to help keep the peace.

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Some Famous Faces

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Once Alcatraz Penitentiary was fully up and running, it became the home of some of the country's most notorious criminals. Al Capone and George Kelly are two of the most recognizable names, as well as one man labeled "Public Enemy Number One" by the FBI.

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That man was Alvin "Creepy" Karpis, and he is one of four criminals to ever be given the title. He is also the only one of those four to be taken alive by authorities.

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Any Survivors?

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As we said, there were a total of 14 escape attempts from 36 prisoners on the island. Of those, none officially made it to shore. Six were taken to the grave, 23 were captured alive, and two drowned. As for the other five, they are listed as "missing and presumed drowned."

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That means that while there is no proof that anyone successfully escaped Alcatraz, it is possible. Considering the conditions surrounding the island, though, it is unlikely they ever made it to the shore.

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An Escape Attempt Immortalized

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Of all the escape attempts, the 13th is the most interesting one. It involved three men: John Anglin, Clarence Anglin, and Frank Morris. They planned an elaborate escape and successfully made it into the ocean.

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The attempt was immortalized on the silver screen in 1979's Escape from Alcatraz, starring Clint Eastwood. The story doesn't end there, though. In 2013, a letter "written by John Anglin" was delivered to the police. Is it possible these three men survived the freezing currents of the San Francisco Bay?

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What Does It All Mean?

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Once Alcatraz Penitentiary shut down, it became a major tourist attraction. Tourism, of course, is not what interested the Binghamton University team led by Timothy de Smet to the island. They wanted to know what was beneath the surface.

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To look beneath the surface, the archaeological team used lasers to pierce the layers of concrete. With this incredible technology, they could see underground without causing any actual damage to the highly profitable and heavily-visited location.

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The Future Of Archaeology

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Making such a momentous discovery could pave the way for an entirely new kind of archaeological surveying -- non-invasive. This, maybe more than anything, was the greatest discovery that de Smut and his team made.

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The future of archaeology is now looking as bright as ever according to de Smet. "With modern remote-sensing methods like these, we can answer fundamental archaeological research questions about human behavior, social organization and cultural change through time without costly and destructive excavation."