Easily my favorite book. I too have recently reread it and it seems to continue to improve. The following passage by Captain Nemo sums up my feelings when diving:
The sea is everything........Its breath is pure and healthy. It is an immense desert, where man is never lonely, for he feels life stirring on all sides. The sea is only the embodiment of a supernatural and wonderful existence. It is nothing but love and emotion; it is the 'Living Infinite,' ..........The sea does not belong to despots. Upon its surface men can still exercise unjust laws, fight, tear one another to pieces, and be carried away with terrestrial horrors. But at thirty feet below its level, their reign ceases, their influence is quenched, and their power disappears. Ah! sir, live -- live in the bosom of the waters! There only is independence! There I recognise no masters! There I am free!"