Ok, so we go back to the Medbay and tell everyone we're going topside. Tell C-16 to stick with Leo when she leaves the Medbay, tell Hunter to stay either in the medbay with SUPER TURRET, or with C-16.
Let LEO know about NECROPUTER, and that we have already shut down a few systems, but we may get more information to shut down EVEN MORE. Also, tell LEO to go to the Security Room, WITH C-16, and, once we radio we are out of the Mine, to SHUT THE DOOR BEHIND US. And ONLY open up the mine when WE tell her to.
In fact, tell her to sesl ALL the doors she can from the security room. Only open the ones she needs to, when she needs to.