I always thought of Jacques Cousteau as film director, maybe scientist or biologist.
Today I've read in wiki, that he was academician, the co-inventor of aqua-lung, he worked over first waterproof film cameras.
Sounds logical, but I didn't expect this.
Moreover, he was the man who worked over (and experimented with) ships with sails working on Magnus effect. The turbosail technology was co-invented by him, but there is only one ship using it — the Alcyone, one Cousteau was engineering with his team.