Locke enters the hatch and discovers Desmond Hume (Henry Ian Cusick), who shows Locke and Jack an orientation film explaining that the hatch was once used for studying electromagnetism and a specific series of numbers has to be entered into a computer terminal every 108 minutes to prevent an unspecified catastrophe. Seeing that his replacements have arrived, Desmond leaves. While Jack is reluctant to enter the numbers, Locke convinces him otherwise. When a man named "Henry Gale" (Michael Emerson), arrives in the jungle (captured in a trap set by Danielle Rousseau), Locke holds him prisoner in the empty armory. The blast doors in the hatch all descend, and they end up falling on Locke's legs. Locke tasks Henry with entering the numbers in the computer. Locke notices a strange map drawn on one of the doors when the lights go out, which he manages to sketch after the blast doors rise again. Locke and the other survivors soon find out that Henry was lying about his identity and he is a member of The Others, but he refuses to speak to anyone but Locke. He taunts Locke by telling him that his people saw the hatch as a joke, and that he never entered the numbers in the computer, which results in Locke starting to believe that the button is not real. When "Henry" escapes, Locke and Mr. Eko (Adewale Akinnuoye-Agbaje) enter the jungle to search for him but find the "?" on Locke's map, where they discover the station, which explains that pushing the button is just to test the occupants of the hatch. While Locke believes that the button is fake, Eko feels the opposite. Locke abandons pushing the button, and he and the recently returned Desmond sneak into the hatch to allow the timer to reach zero, but when the electromagnetic force builds up, Locke realizes that he has been wrong all along. Desmond then turns the fail-safe key that causes the hatch to implode.