the production on animal welfare grounds. Camera operator Alan Perry did not remember any of the crocodiles being mistreated; series supervising director Desmond Saunders, however, claimed that more than one specimen died of pneumonia after being left in an unheated tank overnight. Director David Elliott, though filming a different episode at the time, recalled that another dislocated one of its limbs after receiving an electric shock. Puppet operator Christine Glanville admitted that the filming would not have been pleasant for the crocodiles as the tanks contained "all sorts of dirty paint water, oil and soapy water to make it look swampy." Saunders commented: "It was scandalous. It was one of the great episodes. Nevertheless there was a price to be paid for it." Animal cruelty concerns prompted an anonymous telephone call to the RSPCA, which sent an inspector to the studios. After a brief investigation, no action was taken against APF. This coincided with a decision to increase the voltage of the electric shocks to induce greater movement from the crocodiles. According to Gerry Anderson, when the inspector arrived, "Meddings explained that his team were laying the crocodiles down and they weren't doing anything. They were just lying there. The RSPCA man said, well, they would, because of the warmth of the lamps. So Derek said, 'We've been giving them a touch with an electrode just to make them move.' The guy asked what voltage they were using and Derek said it was about 20 volts, and the guy said, 'Oh, they've got terribly thick skins, you know. If you want them to move, you'll have to pump it up to 60.'" The inspector later joined the production to work alongside the crocodiles' handler. Filming with the crocodiles was often hazardous. During a promotional photography shoot featuring Lady Penelope (who does not appear in the episode), one of the animals attacked the puppet and destroyed one of its legs. During the filming of a particular scene, Meddings was pulling a crocodile towards him on a rope when the animal slid out of its harness. In his book 21st Century Visions, Meddings wrote of the incident: "My crew never saw me move as fast as I did to get out of the tank when I pulled the rope and realised the creature was free." Of the largest crocodile, which was kept at the back of the stage when not being used,