Troy | Clara
Well if you're dreaming of a similar man, then his TARDIS is what allows you to speak Russian. It gets into your brain and alters your mind so that you can understand all languages. It translates everything.
Skaldak... the name rings a bell, but only slightly. I have met Ice Warriors before, well dream me has, in ... the dreams obviously. Weird that such a creature would be on its own, and on a Russian sub?
And right! Yes, well that makes sense. Because ghosts couldn't actually be actually real.