Quel mot conviendrait-il pour décrire quelqu'un qui n'était pas très au courant?

contingent
épilepsie
ignorant
sublime

Which of these authors wrote a story that revolved around a captains underwater adventures with his crew and a sub marine long before the submarine was actually invented

What is the italicized part in the sentence , all of the operators are efficient.

What other theme is addressed in the passage?