The hatch suddenly traps Locke, who is forced to ask Henry to enter the numbers into the computer. Ana Lucia, Sayid, and Charlie return and reveal that "Henry Gale" is lying. Locke remembers the favor that his father asked of him.
A brilliant, brilliant episode with some great moments within the hatch, the part where Locke gets impalled by the blast door went through me and the part where Locke sees the blast door map was strange.
Henry Gale begins to fail in his cover up as Henry Gale at the end of the episode where the others return to the Hatch this had me on edge and I wanted to see more.