Summary
Highlights
Alcatraz, also known as "The Rock," was America's most infamous and secure prison, housing notorious criminals like Al Capone and Machine Gun Kelly. Despite being only a mile offshore, escape was deemed almost impossible due to icy waters, deadly currents, disorienting fog, and even fierce predators. New investigations, using high-resolution sonar and computer graphics, drain the San Francisco Bay to reveal the seabed's secrets and understand the island's reputation. The video also hints at re-examining the 1962 escape and Alcatraz's unexpected role in a future earthquake.
Alcatraz, situated in the middle of San Francisco Bay, served as a supermax federal prison for 29 years, designed to isolate and contain the most problematic inmates. Ranger John Collwell, who has worked on the island for over 25 years, details its history, from an Army fortress in 1853 to a federal penitentiary in 1934. The prison's high security, with one officer for every three convicts, aimed to prevent escapes, yet the constant view of freedom on the mainland was a persistent temptation. There were 14 official escape attempts, with five men unaccounted for. Early attempts, like the 1937 escape of Row and Cole, ended with prisoners presumed drowned in the treacherous bay. The fear of sharks was also a prominent deterrent, further solidifying the prison's reputation.
Draining San Francisco Bay reveals Alcatraz as a bedrock pinnacle surrounded by ancient mountains, remnants of a long history of earthquakes. Geophysicist Tom Parsons explains that San Francisco is sandwiched between the San Andreas and Hayward faults, making the region highly volatile with a history of large earthquakes. Over 100 million years ago, the subduction of the Farallon plate created the Bay Area's landscape, including Alcatraz. Ten thousand years ago, melting ice filled the valley, forming San Francisco Bay and turning Alcatraz into an island. This geology profoundly influenced the bay's powerful natural forces.
The most famous escape attempt occurred in 1962 when Frank Morris and the Anglin brothers meticulously planned their escape, using homemade tools, dummy heads, and a raft made of raincoats. They entered the water on the North End of Alcatraz around 11:00 p.m., coinciding with a strong outgoing tide. Analysis of the seabed by Patrick Barnard from the United States Geological Survey, using high-tech multi-beam scanners, reveals a deep gorge under the Golden Gate Bridge and giant sand waves offshore. These formations are evidence of massive tidal forces, funneling two trillion liters of water through the narrow channel with flows 160 times greater than Niagara Falls. These fierce currents highlight the extreme danger the escapees faced.
Besides the powerful currents, inmates faced other deadly hazards. Former inmate Bill Baker attests to the frigid water, stating it was "the wall that kept us here." The cold water is due to the upwelling of cold ocean currents, and average temperatures range from a bone-chilling 51 to 60 degrees Fahrenheit, leading to rapid hypothermia. Furthermore, when this cold water mixes with warm air, it generates dense fog, a common phenomenon in San Francisco caused by a sea breeze flowing over cold coastal waters. While fog could offer concealment for an escape, as seen in the 1937 attempt of Row and Cole, it also caused extreme disorientation and made rescue impossible, contributing to their presumed demise.
The San Francisco Bay is a graveyard of lost ships, with dozens of shipwrecks littering its seabed, a testament to the bay's dangerous conditions. The wreck of the City of Chester, which sank in 1888 after colliding with the Oceanic in thick fog, demonstrates the bay's destructive power. The collision, exacerbated by powerful currents and dense fog, resulted in 16 deaths. This historical tragedy underscores the immense challenge faced by the 1962 escapees in their flimsy raft, highlighting the slim odds of survival against such natural forces.
The fate of Frank Morris and the Anglin brothers remains a mystery, with rumors of their survival conflicting with the official FBI report of presumed drowning. The FBI did recover debris from their escape, including life vests and paddles, scattered throughout the bay, suggesting the powerful currents played a significant role. To investigate further, Patrick Barnard and Josh Logan conducted buoy tests under conditions similar to the escape. While some buoys were swept out to sea, one was caught in a giant eddy caused by a bedrock sill, stopping it dead. This explains the scattered debris, as items could have been held near the island or carried out to the open ocean, where the 'Red Triangle' (known for great white sharks) awaited. The tests show the unpredictability of the currents, making their survival highly unlikely.
Alcatraz closed in 1963 with a perfect record of no successful escapes, proving that the bay's unique geology – deep gorges, sand dunes, bedrock pillars, powerful currents, and predators – truly made it an inescapable prison. However, the video concludes with an intriguing twist: Alcatraz could be a safe haven during a major earthquake, known as "the big one." Tom Parsons explains that while a magnitude 8.2 to 8.4 earthquake on the San Andreas Fault would cause widespread devastation in San Francisco, Alcatraz, being built on strong, ancient rock, would likely remain standing. This creates an ultimate irony: the island from which so many men desperately tried to escape could become the safest place in the Bay Area during a catastrophic event.