 The Recovery Vehicles, which appear only in this episode, were designed by Mike Trim in his first major design work for APF.In the series' alternative two-part format that was broadcast in some UK regions, part one of "Pit of Peril" ended with "Thunderbird 1" blasting off from Tracy Island while part two began with an abridged version of a scene in which the army personnel discuss the situation while standing at the edge of the pit.Several other scenes were also shortened.