Obtained from: Titus Kabui
Difficulty level: Very hard
Find your way to the armory in cell block B
It is time for another try to find weapons. This time you'll go to the Block B, where worst prisoners were locked. In order to get there you have to go to the basement #1 (1). Generally you have to go straight forward there. You'll reach closed gate (2) #2 there, which you have to bypass somehow.
Right next to the larger room (3) you'll find a gas tank #1. Use it to kill zombies which attack you. In another part (behind other tank) you'll come across more Walkers #2. You might again use a gas tank to get rid of them.
You'll get to a descent (4) #1 but it is better to stay where you are. This will give you an advantage over zombies and policemen in a shooting #2.
You should still stay on an upper level (for the last time) and take an advantage again. There are few gas tanks in the room, so blow up zombies #1, #2.
This time you have to use the lower level in order to get to the stairs (5) #1. Watch out, there is a Thug guarding them. Go up the stairs - you'll find yourself in a control room #2, but unfortunately the door leading inside is blocked. You have to cross through the entire prison block.
Literally a hell awaits you, because inside the block you'll come across infected, Walkers, Rams, Thugs and a Suicider #1. First go down to use a stairs on the other side of the block. Move forward eliminating threat after threat and going up (note: if you reach the proper floor and you die, there is a chance that you'll respawn in the control room). Finally you get to the control room #2. At this point a Voice contacts you, and tells you to abandon your current plan.
Use the door leading to the stairs and go down the bottom, to the sewers (1). Above you can find map of the sewers - these are not very complicated and you have to reach their second end. Along your way you'll come across few groups of undead (also with a Floater) #1. Your target is a ladder leading to the Block C (2) #2.
Leave the sewers - you'll find yourself in the bath (1). Leave this room and follow the corridor until you meet Yerema and Jin (2) #1. After few words of explanation what has happened in the canteen, follow both women to the elevator (3) #2.