The Pillar of Autumn vacation
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Through a glitch, the player can go through the glass of the airlocks that lead to the escape pod's of the UNSC Pillar of Autumn. After going through the hatchway by crouching and jumping you will fall. Upon reaching the invisible "floor" (a form of "invisible wall") you may lose some health. If it works correctly, you will be able to explore the underside of the Pillar of Autumn.
It has been discovered that the same glitch applies to the final airlock in the level. The effect, walls and area are the same but the end cutscene may stop you.