Fantastic Voyage (1966)
In Fantastic Voyage (1966) the scenes of crewmembers swimming outside the sub were shot on dry soundstages with the actors suspended from wires. There was some additional hazard involved because, to avoid reflections from the metal, the wires were washed in acid to roughen them, which made them more likely to break. To create the impression of swimming in a resisting medium, the scenes were shot at 50% greater speed than normal, then played back at normal speed.
When filming the scene in Fantastic Voyage (1966) where the other crew members remove attacking antibodies from Ms. Peterson for the first time, director Richard Fleischer allowed the actors to grab what they pleased. Gentlemen all, they specifically avoided removing them from Raquel Welch’s breasts, with an end result that the director described as a “Las Vegas showgirl” effect. Fleischer pointed this out to the cast members - and on the second try, the actors all reached for her breasts. Finally the director realized that he would have to choreograph who removed what from where, and the result is seen in the final cut.
Raquel Welch in Fantastic Voyage, 1966.