Under the Lake (TV story)

 was the third episode of the ninth series of Doctor Who produced by BBC Wales.

It saw the series revisit the concept of ghosts and hauntings, last explored in the television story Hide. The episode poses another explanation for the apparitions, in this case as resurrected transmitters of an alien presence's signal.

It also continued the thematic concept of the Doctor apparently facing death, with the end of the episode setting up yet another opportunity for the Doctor to reflect on his mortality.

Synopsis
Arriving on an underwater base under attack, it's up to the Doctor and Clara to save the frightened crew. But also onboard is an alien spaceship, and the base is being haunted by the most impossible of things.

The Doctor's deepest beliefs are challenged when he encounters something he cannot explain. Can it really be possible? Can ghosts be real?

Plot
In a underwater mining facility based in Scotland, 2119 designated The Drum, the captain, Moran, is recording a log in his journal. Moran states that the team has discovered a small craft located on the bank, and, as they are unable to analyse it from within the base, they have brought it inside, where he and the crew will investigate.

A crew member named Lunn interprets the sign language of another crew member, Cass, saying that the reason for its sudden appearance is due to underwater movement and shifts on the floor of the lake. Another crew member named Pritchard recommends they discuss ownership the spaceship, prompting Moran to tell everybody to stop calling it a spaceship, as they don't know what it is.

The crew enter, and Moran notices something inside the craft, asking Lunn to hand him a torch. Lunn does so, but glimpses a ghostly figure reflected in the glass. He reluctantly hands Moran the torch. Moran investigates four strange markings on the wall, whilst Lunn asks Cass why he shouldn't go inside. Whilst they bicker, Pritchard cries out as he glimpses the ghost, accidentally starting the engines. Moran pushes Cass out of the way of the boosters' range, but is struck by the blast, forcing the crew to retreat, leaving him behind.

O'Donnell, another crew member, bangs on the sealed door, demanding they go back for Moran, but is told it is impossible by the rest of the crew. She yells at Pritchard for messing with the controls, but is interrupted as Cass screams. She turns, startled to see Moran hovering in front of her. The other ghost appears, and pair begin to attack the crew.

To be added

Cast

 * The Doctor - Peter Capaldi
 * Clara - Jenna Coleman
 * Moran - Colin McFarlane
 * Cass - Sophie Stone
 * Lunn - Zaqi Ismail
 * O'Donnell - Morven Christie
 * Bennett - Arsher Ali
 * Pritchard - Steven Robertson
 * Prentis - Paul Kaye

Individuals

 * The Doctor claims to have once met Shirley Bassey.
 * The Doctor claims that Clara once had an argument with Gandhi.

Food and beverages

 * A cup of coffee is seen on a table.
 * Clara states that the Doctor raved about ghosts "like a kid who has had too much sherbet".

Languages

 * The Doctor can no longer understand British Sign Language. He believes he deleted it from his memories, and replaced it with semaphore.

Popular culture

 * The Doctor claims to have once had Peter Andre's song "Mysterious Girl" stuck in his head for two weeks, and states that it drove him mad.
 * Cass refers to the Doctor doing "the Cabin in the Woods" things.
 * The sonic sunglasses can connect to Wi-Fi.
 * The Doctor uses cue cards to give apologies.
 * Vector Petroleum is the company in charge of the Drum. The Drum's computer system sent messages to the company and advice from the company when certain areas of the base were under attack.
 * Clara refers to people with long necks who have been celebrating New Year for two centuries. The Krillitane once resembled long-necked people.
 * The Doctor apparently calculates how long a place cup of coffee has been abandoned by putting his finger.
 * Clara tries to get the Doctor to high five her, unsuccessfully.
 * The base has a Faraday cage which the ghosts cannot enter, or, if inside, exit.
 * The Doctor refers to holograms.
 * Drum Control is where the rest of the base is controlled.
 * The Doctor states that his UNIT security visa is 7-1-0-Apple-0-0.
 * The base have a submarine that can be controlled with submarine manipulator rings.
 * A suspended animation chamber is found under the water.
 * Topside is the name given to the operating force on the surface contacted by the Drum.
 * The ghosts use magnetic coordinates.
 * The Doctor took his radio apart, according to Clara to make a clockwork squirrel.

Story notes

 * The Radio Times programme listing was accompanied by a small colour head-and-shoulders shot of Morven Christie as O'Donnell, with the accompanying caption "Doctor Who / 8.25 p.m. / Could O'Donnell and her colleagues have fallen victim to undead beings?"

Ratings
3.74 million

Production errors

 * Recordings of Prichard's drowning portray his words and movement slightly differently.

Continuity

 * The Doctor uses his sonic sunglasses. (TV: The Witch's Familiar)
 * One of the ghosts was previously a Tivolian. (TV: The God Complex)
 * The Doctor has previously landed in an underwater base, in which he met with a crew that were tackling a threat that would re-animate the dead crew. (GAME: Shadows of the Vashta Nerada)
 * The Doctor uses his psychic paper as proof of ID. (TV: The End of the World et al)
 * The psychic paper tells the crew that the Doctor works for UNIT. (TV: Spearhead from Space et al)
 * One of the Doctor's apology cue cards says: "It was my fault, I should have known you didn't live in Aberdeen". The Fourth Doctor made an identical mistake, dropping Sarah Jane Smith off there rather than South Croydon. (TV: The Hand of Fear, School Reunion)
 * Another of the cue cards says: "No one is going to be eaten / vapourised / exterminated / upgraded / possessed / mortally wounded / turned to jelly. We'll all get out of this unharmed." "Exterminated" is a reference to the Daleks, (TV: The Daleks et.al.) "upgraded" is a reference to the Cybermen, (TV: Rise of the Cybermen et.al.) and "possessed" is a reference to various races and beings. (TV: The Impossible Planet/The Satan Pit et al)
 * When the Doctor goes back on his insistence that the phantoms of the dead aren't ghosts, he notes that they aren't flesh avatars, (TV: The Rebel Flesh/The Almost People) Autons, (TV: Spearhead from Space et.al.) or "digital copies bouncing around the Nethersphere". (TV: Dark Water/Death in Heaven)
 * The Cloister Bell alerts the Doctor to a threat to the TARDIS. (TV: Logopolis, Resurrection of the Daleks et al)
 * The Doctor indirectly refers to Danny Pink (TV: Into the Dalek, et al) when suggesting Clara begin a new relationship.

DVD releases
to be added

Blu-ray releases
to be added