What felt like turbulence soon turned into a full plane crash. During the hectic rumble, you see a large claw-like pass through the plane (as if it was a ghost, and later said to be a beak). A plane crash would normally have all of the passengers killed right? Well not a single passenger died in the crash, and the plane was largely intact.

I think they were sent forward in time, where they had already existed and passed away. The first tower is the grave for Mina who passed away at a young age. Her rich grandfather built the island using grounded garbage as a base, then layered dirt on top. He then looked at Mina's drawing and saw that she loved prehistoric animals (explaining why there are 2 of Mina's drawing, one in her note book, one in the "lighthouse" tower) and had them engineered. But he knew that these animals would get around her grave and desecrate it, so he built the traps around it. After the genetic failures broke free and trashed the labs, the rest of the animals were set free, and began to kill all the humans that populated the island. They attempted to escape, yet crashed. These cars aren't known by the current survivors because they were made ahead of their time. The rest is to be scene...