My cousins was aRGUING ABOUT THIS WITH ME FOR LIKE all of season 5,
My theory is that whatever jack and sawyer and the likes tried to do in 77 with the bomb didn't work because we can see in 2008 that they came to the isand via 815 anyway no matter what they do!
My cousins thinks that both 1977 and 2008 are hapening at the same time and whatever happens in 77 will drasticly (poor spelling) change 2008 e.g. if they were to succesfully set off the hydrogen bomb in 77 a huge gaping hole would suddnly open in the middle of the island in 2008
who do you think is right?