The unforgettable sight of palm trees moving aside to allow Thunderbird 2 to make its way towards its launch ramp has remained in the minds of viewers for six decades. Now, with previously unseen film material, behind the scenes stills, and archive research – this extra instalment of our behind the scenes investigation, Thunderbirds Unseen, sheds new light on of the creation of this well-loved scene from Gerry and Sylvia Anderson's classic television series.