Oh yeah I didn't notice that!
It's confusing about the TARDIS. I was looking for information about it and found this on The Impossible Planet episode page on Wikipedia
The Doctor mentions that TARDISes are grown rather than built. However, this seemingly contradicts Warriors' Gate where it is mentioned that K-9 has a full set of TARDIS blueprints and Romana can build one with the help of the time-sensitive Tharils. Omega also boasted that he would be able to build a new TARDIS while stranded on 20th century Earth in Arc of Infinity. Actor John Barrowman mirrored this comment when talking about the piece of "TARDIS coral" Captain Jack keeps in his office at "the Hub" in a special feature in Radio Times October 28–November 3, 2006, he also mentioned a "carving process" which may mean that these previous comments are still correct if one has access to enough "TARDIS coral". Another "grown" spaceship was seen in the Seventh Doctor serial Battlefield (1989).







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i just found this while browsing wikipedia