Collecting supplies from zombie prison guards and there offices (maybe after you kill them) to collect for an escape off altatras island. You gotta collect keys from guards to get into their offices and some secret rooms etc. Get special perks and stuff too, like booze for pain killers but with the bad aim downfall. Also guns can be found from fallen or alive prison guards or in their offices. The escape is You gotta get parts for a hot air ballon. There are a couple problems you got to deal with before you can escape. you got to defeat the beast (boss zombies) which is in a special cell to get to a escape tunnel that he was starting to digg in his cell but you can only see the tunnel if you look at obvious enough clues and writtings on the wall and scratches etc. You also have to have the key to open his cell that you get from one of the ofiicers/offices closest to his cell. There are clues to an escape plan that he was starting to write after all hell broke loose. Says something like this, get supplies to build hot air balloon, dig tunnel build supplies at beach and leave. It is about a tunnel to the beach and an air ballon. (it shows you got to get an emergency raft from the head officers office. and rope from the cave. and a lighter from the wardens office jsut outside beasts cell and gasoline from (somewhere) and beasts special bucket he was making for the escape. it is a bucket with a metal cover and a hole at the bottom. and the beast has been sewing together a sheet for the ballon of the air ballon (also he will drop tools essential for escaping) You got to use the tools the boss zombies drops to continue digging the hole until you find your self at an under ground cave with alot of zombies. (FYI Once you beat the beast you make it so that the zombie spawning rounds end and it spawns all the zombies (ALOT) at the end of the tunnel (in the cave)  because you are making an escape. I guess it could be like a boss round in the scripts just with alot of regular zombies instead of a boss, you will see why i say that. - i thought this out.). Once you open the tunnel the zombies see you and you gotta shoot for you life with all you got and you can runn all the back back up the way you came while you do so. Once you beat the zombies the regular zombie rounds start again from where they left off. and you got to get all the supplies and build the hot air ballon fast! . Once you build the hot air balloon you then fly away (FYI this is how the hot air ballow works.. the special bucket is to be filled with gasoline for the flame to make the hot air balloon fly and the raft is the floor of the hot air ballon and the ropes tie it all together.)