In a similar vain of theatrical pioneering, the 1954 production of 20,000 Leagues essentially wrote "the book" for Hollywood underwater film-making. The Nassau crew set what was then a world record for the amount of divers underwater (typically up to 20 in front of the camera and another 25+ behind). Indeed, the entire operation was so unprecedented that the US Navy sent several of its own men to see if they could learn anything from it.
No studio would never do something like that today. That man really did have guts.

