The Machine

The Machine was one of the earliest forms of TARDIS. It was created in the time of Omega. The Other used it to get Patience off of ancient Gallifrey.

Description
The Machine was primarily a central column, nearly a mile tall, with ten metre-thick cables spilling out of it. While primarily grey in colour, some of its panels had been removed to reveal yellow and orange light sources. The cables and power couplings had grown out of the Machine in an organic fashion over the millions of years it had lay buried under the ice of a remote planet. At its base was a door leading to a small antechamber that functioned as a control room. The Machine was dimensionally immanent: it was smaller on the inside than the outside. (MA: Cold Fusion)

Behind the scenes
The description of the interior of the Machine resembles the interior of TARDIS seen in the film Dr. Who and the Daleks.