
The Portuguese began to explore our little corner of the Indian ocean in the 1530s. That gives us around 350 years for initial development of our little community, and a further 200 from that rediscovery until our period of interest; a bit longer before the expansion of exploration makes discovery unavoidable later in the 18th century.
Records from the middle ages are scant enough to allow the disappearance of hundreds or even thousands of people to go unnoticed. We can put the last 200 years down to the work of the Society of New Jerusalem. The early explorers who returned to report small desert islands in the area came back wealthy -- and carefully watched -- men.
Promising! The Central Pacific Ocean was still largely unexplored by the mid-18th C. A good location for an as yet 'undiscovered' continent, Mu (the land of the Lemurians, the 'Pacific' version of Atlantis) for instance.
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