A sky with no light

Are there still unexplored regions of the world?Is there a land beneath the sky that the sun''s rays do not reach?Why was Professor Ashraf Safi so certain of the lost island''s existence, and how did he spend fifteen years of his life searching for it?"Before his eyes appeared Rowan''s necklace, made of distinctive stones, shining with a strange, unfamiliar luster. He wondered in amazement, "Do the island''s inhabitants know the sun to the point of naming their stone after it?""The sun hidden above the canopy has significant significance. It is the primary source of energy for creatures in the outside world. But these unique stones are, in a way, their own sun. Perhaps they actually satisfy their need for the sun, which is why they chose this strange name for them! They are the island''s treasure, something they cherish more than their lives. But we need them, and we will not leave until we obtain them!"