days later on 25 August at the closed Wood Lane tube station. On 27 August, filming took place at Hammersmith Bridge. The location was chosen as it provided easy access to a hospital in case any performers swallowed river water; a taxi remained on standby. Dalek operator Robert Jewell could not gain enough traction to move his Dalek out of the river; the prop was attached to a cable to help. Doctor Whos first filming in a quarry took place on 28 August at Stone, Kent. Peter Hawkins and David Graham recorded Dalek voiceovers on 16 September. Rehearsals for the first episode began on 14 September in White City, and weekly studio recording began on 18 September in Studio 1 at Riverside Studios. Though smaller overall than Lime Grove Studios, the complex used for previous serials, Riverside offered well-equipped and larger individual studios. During camera rehearsals for the third episode on 2 October, Hartnell injured his back when a prop ramp malfunctioned; when Martin apologised for the incident, Hartnell assured that he would be fine, but producer Verity Lambert insisted that he take several days to rest. Following discussions between Hartnell's solicitors and the BBC's, the BBC denied liability and paid for an X-ray. Hartnell was given a week off to recover, and the fourth episode underwent minor rewrites; Edmund Warwick doubled for Hartnell as The Doctor in the episode. The final episode was recorded on 23 October, marking a year of production since the filming of the show's first serial; recording was delayed by half an hour due to some technical facilities being used by coverage of the 1964 Summer Olympics. The production crew anticipated the final episode to be one of the most technically complex. The recording suffered some camera and sound issues, causing Hartnell to stumble some speeches. Hartnell omitted two lines from the Doctor's closing speech to Susan. Ford recorded footage of the cast between camera rehearsals on her personal 8 mm film camera. Reception Broadcast and ratings The Dalek Invasion of Earth was successful among viewers, with an additional four million viewers over the previous serial: the first episode received 11.4 million viewers, which rose to 12.4 the following week. The third and fourth episodes received 11.9 million, which dropped to 11.4 for the fifth episode, and rose again to 12.4 for the final. The first episode was the highest-rated BBC programme for northern England,