My thoery is that they are on an island and that they are lost... bare with me here... so there lost right, and they like cant be found, why?! thats simple because like the plane is way of corse and the search party are looking in the wrong area.
So anyways there is like polar bears and shit running around killing people.
i know its far fetched but thats my thoughts
(seriously im acually liking the Bermuta Triangle idea... i think thats whats going on)