We have the trio on the hunt for the place where the hot air balloon was, all this just to confirm his story, we see that Charlie had gone and got some ruit for breakfast and we have Sayid watching over Ana as she sleeps.
Jack goes to ask Hurley when the others left and was surprised to hear him say yesterday, Jack makes some remark about being told these things, Hurley's reply is "in the loop dude" obviously meaning a two way aspect. He then decides its too late to go after them, his attention is also required by Claire who needs him to.
The trio has reached the area where they were directed by the prisoners map, they go into each area assigned and spent three hours before they decide to call it a day, just as they were doing so, Charlie calls them over, as he has discovered something.
Bank in the bunker, there is a noise coming through the speakers that Locke is trying to hear, but the prisoner keeps shouting about whats happening, to the extent that he can't hear it. The blast doors then come down, Locke is able to put a crowbar under one door, just before it hits the floor. After a short while, knowing that the button needs to be pressed, he unlocks the door and places alot of faith in the prisoner. They try to force the door up and managed to a small way up, then they placed the tool box under it to hold it in place. Because of the countdown, Locke goes to shimmy under the door, but as he does so the door pins him to the floor.
There is a major trust issue now, Locke has to trust him, as he explains the countdown then directs him through the ventalation system and gets him to reset the countdown, Locke is calling out his name but to no avail, but then he does come back, just as the other three come back with guns drawn, as they found everything was as he said, but Sayid dug up the grave to find the real guy who the prisoner claims to be, as they also found the guys driving licence.