That sucks :/
Charlie in Lost thought that sending a certain signal to these people and him dying (another person there has visions about him dying) would save the girl he loves and everyone else. It turns out though that the people coming to suppossedly help them aren't who they seem to be. It was stupid to because Charlie could have ran out the door and swam back to the surface of the island (one of the other's swam to the side of the room Charlie was in-they're in an underwater station- and made a grenade blow open the window, and instead of escaping Charlie locks himself inside and drowns himself because his death will save everyone- which turned out wasn't true)
It's been a while since I saw the episode, so that's not all the details, but mainly that's it.
