Theory: Helly Investigates the Testing Floor Alone
From the episode 9 synopsis, it seems like Helly makes her way to the testing floor by herself.
She follows Irving’s instructions.
This shows her heading to the testing floor.
The background with all the doors looks like the testing floor.
I don’t think she would turn into Helena on the testing floor as some have speculated here since her chip was never programmed to go down there. Instead, she could act like Helena, investigate everything herself, and do what Helena did to her.
Meanwhile, Mark is back on the Severed Floor, with Drummond coming after him.