Spiral Chamber

The Spiral Chamber was an item of Time Lord design and was present on their homeworld of Gallifrey.

The machine was ancient and acted as a portal into the Spiral at the nexus of the Time Vortex. Rummas stole it from Gallifrey and took it to Carsus. The Doctor used the Chamber to trap the Monica Lamprey and destroy her. (PDA: Spiral Catch)