Thread:TEOR-MMMM/@comment-35691777-20190919030902/@comment-36309590-20191011024744

As to why the TARDIS needs Artron Energy or fuel, basically the exterior and interior are linked through some timey wimey Time Lord shite, so it takes power for the main "house", or pocket universe/interior rather, to move the exterior/doorway. And since the two are linked, any damage the exterior takes while in the Vortex or normal space, the interior takes as well. Same applies for crashes or collisions with other ships. If you crash into the east most side of Trevans TT Capsule for example, one part of your ship would pierce through into the interior as it and the exterior are linked, and the rest would remain outside in normal space/reality.

(Sorry if I went off on a tangent, but after thinking I figured out how a TARDIS is dimensionally-transcendental and how it actually works, I couldn't resist).