The Amazing True Story Of The Great Escape From Alcatraz
The Good News
Lucky for them, Alcatraz was already considered old and crumbling, even in the 1960s. Saltwater would run through the pipes when prisoners showered and washed dishes, which over time would destroy the pipes. It also leaked into the walls which would soften them.
Thankfully, they knew this and organized when and where to chip away in the right places. Over time, it became easy for them to chip at the weaker parts and erode the hardened building. Prisons definitely aren’t like this today!