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this img is titled 4815162342. that giant blob (northeast of aus) looks like the location of the island.
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I made a post about this a few weeks ago, I can't claim the original theory, but if you map it out they're lat/long coordinates.
(4, 8, 15, 16, 23, 42)
Lat: 4.815
Long: 162.342
mapquest, you might have to zoom out