Sentence:  &#91;[https://books.google.com/books?id=EVCA0S427ikC&pg=PA39 page 39]&#93; <WSD>HydroPhobias</WSD> begin on land long before casting off. But once at sea, fear is quickly lost in the joys and pleasures of the passage. ... &#91;[https://books.google.com/books?id=EVCA0S427ikC&pg=PA40 page 40]&#93; There are three <WSD>HydroPhobias</WSD>. The Big Three. Two of the Big Three are fears that prevent landlubbers from becoming sailors. The third is primal and common to all mankind. The Big Three are 1) Fear of Flatland, 2) Fear of Being with Self, and 3) The Fear of Bogeymen. 
Meaning of the word marked with <WSD> tags:  A morbid fear of water; aquaphobia.