well here is my last episode of the series theory:
well we know the timer hits zero again, and from the looks of things the computer gets smashed up also the trailer shows an expolosion, we also find out what caused the crash, so i think:
they smash the computer up and then for say 3 times in a row, the timer is no reset. my theory is that the resetting of the timer has something to do with the magnetic field thingy, it say subdudes it in some way. after 3 times it goes out of control and then it gets far stronger. so i guess that it is this which causes things (e.g. boats, planes) to crash on the island. there is a massive electromagnetic field put out that attracts anything metallic in a wide area - hence boats or planes end up there. on top of this i think somehting in the hatch causes the explosion as a result also and so i guess in the next series they will be hatchless as it will be blown up quite a bit.
well thats my theory from what you can see in the trailer. thoughts?