I never miss this film whenever it is shown. This mainly down to the fact that my father Haydn Bartlett made the model used in the film. Unfortunately model makers were hardly ever given screen credits (he never got a credit for his model work on "Those magnificent men in their flying machines" either). I have photos of the model at various stages of construction including one it undergoing river tests and also a photo of the real boat. I remember dad saying that Richard Attenborough kept calling him 'darling' when he was on set (much to dads consternation). I always get a lump in my throat when I watch dads model sink under the waves...