R walls around the forgotten kitchen.

[KikiMofo]

The R walls around it Turn completely black, and unbreakable if you try to remove them.

Which is a shame making the only way to get into the place, Telelab, or getting a little luck with the hand teleporter.

The one in Mining Zlevel? I have no fucking idea how to open that door. I've seen it opened before but dunno who or how they opened it.