Given that the series was set in the relatively near future, Gridneff took great pains to ensure that the space scenes were depicted as accurately as possible, seeking advice from NASA and other space agencies as well as arranging a set visit by astronaut Pete Conrad, the third man to set foot on the Moon. Conrad's input proved useful in making the scenes set in weightlessness as convincing as the budget would allow. Assistance was also received from an aerospace manufacturer, the McDonnell Douglas Corporation, who provided stock footage of astronauts training in a water tank and received an on-screen credit on the first episode "An Instinct for Murder".