Because Henry Gale didn't seem to know all that much about the hatch, for one.
<{POST_SNAPBACK}>
Yeah, well, so what? I would imagine he knows a lot more about the hatch than he let on. The thing that I like about Henry Gale is that he lied until he was given incontrovertible proof that he was, in fact, lying...and then he just started telling a different lie. He's done this under mild torture, several days' worth of confinement, and let's not forget that bolt in his shoulder. Just because he claims he doesn't know anything about the hatch, or that he didn't push the button, doesn't mean that he's telling the truth. In fact, I'm doubting every word he says.