Branch pipe

From Tardis Wiki, the free Doctor Who reference
An illustration of a side vent and branch pipe on a volcano. (TV: The Power of the Doctor)

According to a diagram used by the Spy Master, a branch pipe was a part of a volcano. (TV: The Power of the Doctor)

Retrieved from "https://tardis.wiki/w/index.php?title=Branch_pipe&oldid=3340982"