Here is an interesting comparison of Cortana over the course of the 4 halo games:
PTesh adds his dulcet prepubescent tones over the top of one of the new trailers for weapons...
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Fall Through Elevator
Level: Assault on the Control Room
On AotCR After you go through the outside area with the banshee, two ghosts, a few turrets, and lowered path with two doors at the bottem and an elite in each, grab a ghost by taking out one of the drivers and take it through the level untill you reach an elevator that goes up (should be the first you come to) and put the ghost on it. Get out and activate the elevator. Get back in the ghost and when the elevator moves up, you should go through the floor. If you land correctly and dont flip, you will be at the bottem of the shaft.