Theory:Doctor Who television discontinuity and plot holes/The Beast Below


 * There was only one star whale which saved Starship UK, so what happened to the other starships?
 * As Liz's recorded message refers to other nations leaving before the Whale arrived, it seems the UK was the only one unable to leave on its own.


 * Why is the Doctor surprised that the ship is moving even though there are no engines running? It's a spaceship. The law of inertia means it only needs engines to accelerate or steer.