There are several reasons. For one, It could be called "The Rock" because the prison sits on an otherwise barren island. It can also be because the guards and prisoners who made it to Alcatraz were considered the toughest of the tough.
The Rock
The Rock
The Rock.
The Rock Over the years it was also known as Uncle Sam's Devils Island, and The Ring of Fire.
The Birdman of Alcatraz.
The prison on Alcatraz Island was made of concrete, not rock.
another name for Alcatraz is the rock
White Calla Lily
Alcatraz
Yes. According to wikipedia, episode 23 is The Rock: Alcatraz
the rock
Alcatraz was nicknamed "The Rock" primarily due to its rocky landscape and isolated location in San Francisco Bay. The term is believed to have been popularized in the 1930s and 1940s, particularly through media portrayals and references in movies. While there isn't a specific individual credited with coining the nickname, it has since become synonymous with the infamous prison.