Xander seemed to have already familiarized himself with the whole place and Bell just followed him. Soon, they entered a door that leads to the staircase. It was a staircase that would only take them a couple of levels underground.
Xander thought that it would be safer to use the stairs instead of the elevator.
Soon they reached the lowest level of the basement and in front of them were lines of cells. It was almost similar to Xander's underground prison cell except that the cells here were made for people with inhuman abilities.
When Xander told her that he would be going to Project Regnum's research facility, Bell immediately told him that she wanted to see the other descendants. Xander was reluctant because it would mean that they would have to go to the area that has the highest security but Bell assured him that Brina would take care of the security, which she did.
All this time, Brina has their back.