At the age of twenty, he became an agrégé in history. While teaching at a secondary school in [[Algeria]] from 1923–32, he became fascinated by the [[Mediterranean]] Sea and everything about it. From 1932 to 1935 he taught in the [[Paris]] lycées of Pasteur, Condorcet, and Henry IV. | At the age of twenty, he became an agrégé in history. While teaching at a secondary school in [[Algeria]] from 1923–32, he became fascinated by the [[Mediterranean]] Sea and everything about it. From 1932 to 1935 he taught in the [[Paris]] lycées of Pasteur, Condorcet, and Henry IV. |