One door opens, another door closes

[Roto13]

Jesus, I hate this type of puzzle. The first one with the gates in the mines wasn't so bad, but I just spent the last hour wandering around the laboratory and I'm getting annoyed. >_> Someone give me the general idea of where I should be going next. What floor, and what area of that floor are fine.

[abrojtm]

You're trying to take the lift to floor 70 (I think). It comes from the southern Terminal in floor 68.

[Roto13]

Thanks. I should have guessed. :P