Once everyone was relatively safe on the other side of the wall, they could watch as the far wall settled right against the opening. There was a momentary metallic shriek.

What followed happened all at once.

The metal facade on the walls fell away, revealing massive glass panels with bright orange gas that detected as hydrogen cyanide mixed with other deadly chemicals.

The thin metal plates on the ceiling above them pulled into the walls to reveal a thin membrane of glass. The glass was supporting glowing, light blue goo that detected as highly acidic.

The blocked doorway turned into a large panel giving read-outs on the various systems ready to trip if anyone tried to leave the room. Though there was a head-sized spot where the Imaginauts could peer through to the other room.

If they looked, they would see control panels had raised out of the floor and the door back outside reopened.