Alcatraz escape 1962 explained by concrete chemistry #alcatraz #history #science

Added: 2026-05-17

[00:00:00]They didn't just break out, they dissolved the walls.

[00:00:04]Alcatraz, June 1962.

[00:00:07]Three men vanish from an inescapable fortress. They didn't outsmart the guards, they outsmarted the building's chemistry. The FBI believed the ventilation shafts were impenetrable solid concrete. [music] Wrong. 30 years of Pacific salt fog caused molecular devastation. The original concrete recipe lacked a sufficient amount of binder. This left the calcium [music] silicate hydrate gel vulnerable to chlorides. Saltwater hydrolyzed the bonds, [music] precipitating expanding ettringite crystals inside. Structural engineers call this fatal microscopic swelling process concrete cancer. The walls lost 70% [music] of their original compressive strength. The inmates weren't chipping rock, they scraped chemically dissolved limestone with spoons.

[00:01:00]Chemistry always defeats brute force, given enough time.

[00:01:05]Send this to someone who doesn't know this scientific fact.