Yes. According to Kaiba-kun, it was closed off until a day or two after I arrived, but it had existed before that.

[Yami's firm hand and kind words make him relax, bit by bit. That's right... the barriers were surely too old and strong for Malik and Harriet alone to break through. And on top of that, the other Yugi and the others were strong. They might be able to stop it. He takes a deep breath, calming down, before he continues.]

I'll keep you informed. I promise.