He has an exhaustive knowledge of marine biology, and it is his respect for Professor Aronnax's preeminence in the field that led to his befriending the professor once the latter was cast aboard the "Nautilus". Further, Nemo is a polyglot, able to read all the books in the "Nautilus" vast library, regardless of their language. He demonstrates his linguistic ability in "Twenty Thousand Leagues Under the Sea", when Arronax and two other character speak to him in French, English, German, and Latin and he understands all four languages. Other than this he also knows Indian Language, Kannada, Tamil, Telegu, Malayalese and Greek among others. Nemo also invents a new language that he and his crew use to communicate with each other.