Alcatraz Island, referred to colloquially as ""the Rock,"" was converted from a military stockade to a federal maximum security prison in the 1930's to house some of America's most dangerous criminals. Alcatraz was supposedly inescapable, but in 1962 three inmates would stage a daring escape attempt that continues to impress experts to this day. Tune in when The UnXplained returns this Saturday, July 11th at 9/8c to learn more about Alcatraz and some of history's greatest escapes. | HISTORY

963K views · 11K reactions | Prisoner Who Escaped From Alcatraz Sends Letter To The FBI 50 Years Later! Was Alcatraz, San Francisco’s notoriously inescapable prison, invulnerable to such escape attempts? Well, one letter – claiming to be from someone who successfully escaped the prison – threatens to shatter this idea. Let’s dive into the San Francisco bay and try to get to the bottom of it. | Be Amazed | Facebook

Unravel the mysteries of Alcatraz, the notorious island prison ensconced in the treacherous waters of the San Francisco Bay. As we delve into the deadly geography of Alcatraz, discover how its rugged cliffs, relentless currents, and enigmatic fog created an impenetrable fortress, confining inmates to their isolated cells. Join us on a journey through time, exploring the geological forces that shaped this forbidding island, the chilling tales of escape attempts thwarted by unforgiving waters, and