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The survivors discovered that the island holds many secrets, including a mysterious smoke monster, polar bears, housing and hatches with electricity and hot & cold running water, a group of island residents known as ""The Others,"" and a mysterious man named Jacob. They've found signs of those who came to the island before them, including a 19th century sailing ship called The Black Rock, a downed Beechcraft plane from a failed drug run, the remains of an ancient, four-toed statue, as well as bunkers belonging to the Dharma Initiative -- a group of scientific researchers who inhabited the island in the recent past. The survivors also encountered a freighter stationed off the island that some thought would lead to their rescue, but ultimately almost caused their extinction. And Jack, Kate, Hurley, Sayid, Sun and Claire's son, Aaron -- known as the Oceanic 6 - actually escaped the island and made their way back into the world. But their stay turned out to be short-lived since the island wasn't through with them, yet.