
Synopsis: An underwater base comes under attack from mysterious ghost-like beings.
Review: Toby Whithouse brings us perhaps one of the spookiest stories that we have seen on ‘Doctor Who’ for quite some time.
When the Doctor and Clara land on an underwater base. The pair are embroiled in a mystery to find out why the base is being attacked by ghosts.
The atmosphere that this first part of the two part story manages to generate probably had most younger children hiding behind their sofa’s, but not the Doctor or Clara.
Capaldi is brilliant here in as far as he seems to be generating a bit of the Tom Bakers with his off balance personality and out the box thinking. Clara for her part just wants to go along for the adventure and does not seem to have to much regard for her own safety.
The tardis acting up while on board the station was an interesting plot point, which came into play towards the close of the episode, which left us with an almighty fine Cliffhanger.
Much like last week there was a hint of Clara’s impossible girl story arc being played out, but blink and you’d have missed it.
Give how this story ended. It was almost a shame that we got the preview of next weeks episode directly after the closing credits. It might have been more effective and fun for us as viewers had the BBC opted not to tease next weeks episode for a few days to keep us fan guessing.
A decent start to a two part story with some wonderful visual FX and some pretty scary ghosts.

- Mystery concerning ghosts and tardis jitters
- Would have liked to have seen more resolution on Clara's story-line
- Writing9.5
- Acting9.0
- Visual FX10

This was wonderfully atmospheric set up and I appreciated that they incorporated a deaf actor so seamlessly.