The Doctor tries to get everyone to Rio, but nothing quite goes as planned. They arrive in a small Welsh village where the Doctor immediately senses that the ground isn't quite right. There is a drilling rig nearby that has reached a depth of 21 kilometers when odd things begin to happen. A local village man has disappeared and soon after Amy is swallowed into the ground. The Doctor realizes that the drilling has disturbed an ancient reptilian race that has lived deep underground for thousands upon thousands of years and who are determined to protect themselves against the 'apes' who live on the surface. Written by
Did You Know?
echoed classic imagery from the Jon Pertwee
era: the Discovery Drilling Project was reminiscent of the eponymous experiment in Season Seven's Inferno while the force field the Silurians created around Cwmtaff was much like the heat shield around Devil's End in the Season Eight finale The Daemons. Chibnall also suggested that the Silurian guns could bear a marked resemblance to those wielded by the Sea Devils. See more
The graves around you eat people.
Doctor Who Theme
Written by Ron Grainer
Arranged by Murray Gold
Performed by BBC National Orchestra of Wales See more