This is an episode where I have varying and mixed impressions; so I'll go through them in some form of order and hope that this all makes sense to you... at least more than this episode made to me at times.
- Starting on 21st November 2119 and then jumping forward three days; it should have been two days of course.
- Well, they certainly lit the underwater facility much better than the one from "Warriors of the Deep".
- The Twelfth Doctor is on decent enough form; definitely acting true to his character of someone who is too busy saving the world to care about social niceties - or reading the cue cards. I'm also liking the sonic sunglasses which add levels of functionality that the screwdriver didn't have.
- Clara was good, but not overly so. I think I preferred her in the previous two episodes. I'm probably going to argue that this may down to the writer, Toby Whithouse, having not written for Clara before - or for that matter for the Twelfth Doctor (his last story was "A Town Called Mercy" before he worked on the single season 1970s spy show The Game).
- The black man dies first; it's been a good few years since we had that happen in the show, I would say.
- The 'ghosts' - well, we've had stuff like this before, but it was well done and certainly atmospheric.
- Very interesting idea to have a deaf member of the base crew; although from my own personal experience, not all deaf people are completely mute.
- The rest of the base crew were certainly well-played, but it wasn't explained why they seemed somewhat under-dressed. Scottish lakes are not known for being that warm.
- Apparently flooding a nuclear reactor is a "common" crash procedure to absorb all the neutrons; it was done at Fukushima. But don't you have control rods to try first?
- The ending was certainly an interesting one and it's nice to see some amount of time travel form the key part of the episode.
ConclusionEntertaining enough, but nothing overly impressive. Hopefully part two will be better.