The 46-year - old man is said to have suffered a ` ` massive cardiac event '' He was participating in the 33rd Escape from Hell event . Alcatraz Island , in the San Francisco Bay , is known for a high-security prison that operated there for some 30 years before closing in 1963 . The event included a 1.5 mile swim , an extended road race and an 8-mile run .
The 46-year - old man is said to have suffered a ` ` massive cardiac event '' He was participating in the 33rd Escape from Hell event . The event included a 1.5 mile swim , an extended road race and an 8-mile run .