It is now widely accepted, though officially not admitted, some guys actually, successfully escaped Alcatraz. Having been inside the walls, on the grounds, and witnessed the obstacles faced by would-be escapees, it's a bit mind-boggling.
Of course, there's the bitterly cold water (year around), the brutal currents, and sharks (many Great Whites) and that doesn't count the facility itself. But, Frank Morris, John Anglin, and his brother, Clarence Anglin did it in 1962. They not only got away, but very strong evidence has been uncovered to show they lived out their lives as free men.
One of my favorite YouTubers is Mark Rober and he has taken his considerable intellect and engineering skills to The Rock. Check out what happens.