Climbing the Jungle Gym
The utility corridor was unguarded and full of bars like a jungle gym. If they opened the holes in their cells wide enough to get through, they could easily use the bars to climb the three stories to the roof. After that, they would just have to hope for the best.
At the top of the building, they needed to use one of the large shafts for roof access. They were shocked to discover that many shafts were sealed off with cement. After a panicked search, they managed to find an unsealed shaft and used their homemade wrench to pry it open.
Breaking Through
The Anglin brothers and Morris managed to break through the walls of their cells by May of 1962. The holes they made were barely large enough for them to fit through, but they managed to squeeze their way out
The gang made their life vests and the raft by stitching and gluing raincoats together. They used more than 50 raincoats for the job. These were a vital part of the plan without which they would most certainly drown in the cold bay waters.