I have watched all the lost episodes shown so far on channel 4. Have taped the E4 one last night. Always do that as it's on so late, but at least I can watch it before it comes on C4.
I'm dying to know what's really going on! I have my own theories:
I think the children are 'removed, because they have done nothing wrong, so they don't want them being subjected to what ever it is that's going on.
I also think that when one of the survivors 'dies', they are not really dead, they have just 'passed' whatever test it and have been 'removed' for that reason.
I also think (and I think someone else has already mentioned this) that 'Henry Gale' (the one they have in the hatch) is someone like Desmond. Let's face it, where can they go if they 'escape' from their duties in the hatch? There appears to be no escape!!!
That's all I can think of for now, but if I think of anything else I'll let you know.