I thought the swan hatch quarantine door was just laying on the top of the hatch. [When Eko climbed out because he was trying to find a different way out, he noticed it lying there next to the opening.] For it to shoot up in the air so high i would have thought it would have to have gotten blown from a hatch door that was unopened... Could the explosion have come from an unopened hatch then-- other hatches have had quarantine written on them... OR the original hatch could have blown up so badly that it was just blown into the air anyway? I don't know... any suggestions?