AMC's The Walking Dead left off its third season with a plethora of new prison group members, courtesy of the disbandment of Woodbury.

While the conditions at the prison weren't exactly torturous, TWD production designer Grace Walker recently spoke to AMC about some of her work for the upcoming season, which includes bolstering up the facility for the story moving forward.

"We're trying to form better conditions for the survivors at the prison. We figured because we had a lot more people coming in - like the people coming from Woodbury - that the cellblocks were starting to overflow, so we made more room for them. We had to have better shelter, and conditions where they can now eat outside," she explained.

Grace also revealed some of the tricks of the trade that the crew's learned to make the construction of the sets more rapid and less difficult.

"With the prison, the interiors have worked really well, as we go into them time and time again. We've got it down now where we can remove walls from the cells a lot faster than when we did the first episode there. The main block has 18 cells; nine below and nine above. And we can shoot in any of those cells and take out all the walls, including the rear walls on the second floor as well," she said.

AMC's The Walking Dead will be kicking off on Sunday, October 13 at 9/8 p.m. Central. Be sure to keep checking back for more of the latest details on the hit zombie series. Get an inside look at the fourth season below!

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The Walking Dead, AMC, Television