Quiros seems to have been the first person, who had any idea that such a continent existed, and he was the first that was sent out for the sole purpose of ascertaining the fact.

He did not succeed in the attempt; and the attempts of various navigators down to the present century, were equally unsuccessful.
When the design of accomplishing this great object was resolved upon, it did not admit of any hesitation by whom it was to be carried into execution.

No person was esteemed equally qualified with Captain Cook, for conducting an enterprise, the view of which was to give the utmost possible extent to the geography of the globe, and the knowledge of navigation.

For the greater advantage of the undertaking, it was determined that two ship should be employed; and much attention was paid to the choice of them, and to their equipment for the service.
After mature deliberation by the navy board, during which particular regard was had to the captain's wisdom and experience, it was agreed, that no vessels were so proper for discoveries in distant unknown parts, as those which were constructed like the Endeavour.

This opinion concurring with that of the Earl of Sandwich, the admiralty came to a resolution that two ships should be provided of a similar construction.