"It's okay you don't know, cause I need to tell you the plan anyways. At dusk you'll go through the underground tunnel that I came through with the new Escapees. 
When you get to the end, some of our spies at the other side will have the secret hatch open. You'll climb through and they'll close it behind you.
 All the experiments will still be asleep, so you'll walk through the double doors with the spies. They'll pretend to escort you back in and they'll put you in a cage which will secretly be unlocked. 
The only experiment you need to rescue is Shults. The reason that it's only one experiment is because he is very dangerous. In fact, part of me still thinks that we should leave him behind. But we'll give him a chance..." NaiSky explained.