While the First World War is regularly depicted by the nature of its horror, it was also a period whereby the excitement of inventions and the suggestion of an exciting time to come churned up the aspirations of some. Add to this the imagining of a treasure hunt in an exotic location and the excitement squashed fear.
All you had to do was survive, to learn how to sail. But there was the small matter of the interloper who could make the enterprise so much easier to accomplish. But that man was self-evidently unscrupulous, not to say demonic; it could all be sunk so easily by antagonism so hard to suppress. They all relied on the other and no one was being completely frank. They all lied, as we do.