When iHelly finds the Testing Floor... what happens then?

Even if Helly is able to memorise Irving's instructions and make it to the black hallway, she'll immediately become Helena the second she gets down there – and so the plan will be for naught (surely she already knows everything there is to know about the testing floor).

Maybe then the only way it works out is if innie Helly brings innie Mark with her, that way when they become their outies in the lift at the end of the corridor, he will not only be able to find Gemma in the rooms, but he'll also find out pretty quick that outie Helena is messing with him.