Survivors

Being one of the main points of the game and an important source for money, Survivors are trapped in the lower halls of the facility and need to be rescued; each survivor has a target goal of 5, which can be turned in for a lump sum of money depending on the survivor and if you have more than 5 of one type of survivors, only 5 will be rescued and the rest will have to wait until you save up to five again. To rescue survivors, you will have to watch the doors all the way to the left for a yellow glow, which is the signal for a trapped survivor; when you see it, better tap it fast, because like the Quantum Cubes, it won't last forever.

When you gain the Rescue Force specialist in http://zombie-hive.wikia.com/wiki/Specialists, you have a chance of getting more than one survivor at once and when the chance is 100% above, you will always rescue more than one survivor. On that note, be careful when you get your Rescue Force specialist upgraded, because if the maximum number of specialists saved from is 5 and you have only 4 of a specialist, those 4 will be stuck forever, so when your specialist is one upgrade away from lv 20 which has a 400% chance, make sure your survivor count for every type is either empty or a value of 5.