Here's a rather interesting page from the Dr Who Wiki, regarding various errors of the episode The Hungry Earth:
http://tardis.wikia.com/wiki/Forum:...discontinuity_and_plot_holes/The_Hungry_Earth
While I did like the episode, I couldn't help noticing these things. An explanation offered for the discontinuity with Inferno (which got over 20 miles beneath the Earth's surface and was intended to go all the way to the core) is that the Inferno Project was kept secret from the general public, but why would this be? All it was really doing was looking for a new energy source, nothing particularly sinister. I know I've brought things like this up before, but I can't help feeling a tiny bit irritated by it.
http://tardis.wikia.com/wiki/Forum:...discontinuity_and_plot_holes/The_Hungry_Earth
While I did like the episode, I couldn't help noticing these things. An explanation offered for the discontinuity with Inferno (which got over 20 miles beneath the Earth's surface and was intended to go all the way to the core) is that the Inferno Project was kept secret from the general public, but why would this be? All it was really doing was looking for a new energy source, nothing particularly sinister. I know I've brought things like this up before, but I can't help feeling a tiny bit irritated by it.