How did the walkers enter the prison later?
My understanding is that by episode S03E02 "Sick" of The Walking Dead, Rick and his team had cleaned out the whole prison and hardly one walker was alive in the vicinity. The prison was locked on the outside too. How did the walkers then enter the prison on hearing the alarm bell in S03E04 "Killer Within"? Was some part of the prison still infested with walkers?
Best Answer
Rick's group only clear a single cell block, the one they lived in, and the outside area where they keep their vehicles and later grow crops.
They specifically did not clear the rest of the prison: at one point they discuss it, and decide not to for the following reasons:
It is risky. There are lots of narrow, dimly-lit corridors. They would have to move slowly, and risk being cut off from escape and overwhelmed.
There is not much need to. The doors are secure, being a prison: it would take a live person with specialized tools to break through a door. Walkers cannot use tools or do much of anything other than make noise, bite, and scratch. So "doing nothing" is still an effective defense against walkers.
Finally, the biggest reasons:
The walkers in other cell blocks are a defensive mechanism. If another group of living humans breaks into the prison, they may be in another cell block that is not cleared. That puts them at risk of dying due to the reasons in point 1 above, before they can reach Rick's group.
Rick's group only needs active defense for a much narrower portion of the prison than "all of it" which makes their job easier. Fewer guards patrolling at any given time means more opportunities to stay well-rested, grow food, and perform any other tasks required to survive.
Now, as to what exactly happened in S03E04: the group is split, with most everyone in the courtyard. Walkers appear behind them. Carl turns around and sees them, then they all start fighting. T-Dog makes a comment that "the gate is open" implying that one of the gates to the uncleared area was left open, allowing walkers into C block. The group splits up in the chaos and appear to enter another cell block that is not cleared. When the alarm goes off, this would "wake up" any walkers that were not already actively chasing the protagonists, and they would then respond to other noises and seek out the living.
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How did the walkers get into the prison?
However, Andrew survived, and later lured walkers into the prison in "Killer Within", in the hopes of Rick's group being killed, allowing him and his fellow prisoners to reclaim the prison for themselves.Who opened the gate at the prison on walking dead?
Then we see Carl, walking past Maggie, his face set and lacking emotion. . One of the prisoners that Rick had earlier locked outside the prison takes his rather elaborate revenge -- he has cut open the prison gate, which is how a herd of walkers manages to get in.Did The Walking Dead build the prison?
Trivia. The TV series' prison was hand-built from the ground up by the production crew at the Raleigh Studios Atlanta, located at 600 Chestlehurst Rd in Senoia.How long was the group separated after the prison in The Walking Dead?
It only took four months to get from the fall of the prison to the end of the Negan war, which is what we call \u201cthings escalating quickly.\u201d From the outbreak to Rick's disappearance is just over three years.TWD S3E4 - Walkers gets in the Prison
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Answer 2
They only cleared one block. They were helping the prisoners to clear another one but the deal felt apart and the rest of the prison was left infested.
You can clearly see there were more zombies in the prison towards the end of the episode when Rick chased one of the prisoners to a exercise yard full with zombies and that was just a small part of prison.
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