http://www.nydailynews.com/news/national/felons-escaped-n-y-prison-cuomo-article-1.2250257
" Cops questioned
Mitchell and her husband, who also works in the prison, on Saturday, according to neighbors.
“They were going through her trash,” said one neighbor, who would not give her name."
<snip>
" Matt, 48, and Sweat, 34, were in adjoining cells. Using hacksaws, they cut the 3/8-inch-thick steel walls around air vents near the heads of their cots to form man-size openings they could slip through. They kept the vents in place to avoid detection. The paint on the walls is so irregular and chipped that it was impossible to tell they had been tampered with, the sources said.
The vents led to a labyrinth of cobweb-covered catwalks, but before the cons ventured out, they stuffed their sweatshirts with clothes to fool the guards making bed checks every two hours.
Then, carrying the tools in a guitar case one of the inmates had in his cell, Matt and Sweat shimmied six stories down pipes — from catwalk to catwalk — until they reached the ground floor.
There they identified the main steampipe and followed it through the various subterranean tunnels, figuring it would lead them to the outside.
At one point, they reached a wall and were able to pass through after knocking out a few bricks. The next wall they hit was the massive prison wall, and there was no going through that.
Holes in the stones suggest they tried to drill through it, and then came up with a brilliant Plan B.
Realizing the steampipes aren’t used in warm weather, they cut one opening into the 24-inch diameter steel pipe at the base of the wall — then cut another opening from inside the pipe on the other side of the wall.
It was not clear when Matt and Sweat began working on their escape plan, but officials said it appears to have taken a lot of labor. And to power their tools, they hot-wired the electrical junction boxes and strung extension cords."
<snip>
"“They appear to have taken the tools with them. One of (them) had a guitar case in his cell that was gone, and someone saw two men carrying a guitar case,” said a source with knowledge of the investigation."
more at link. must-read article IMO