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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Level: The Maw
When your in the Warthog in the final run cortana will tell you tto speed up because there is a gap. Go full speed but do not go strait ,go a little to the left and you will land on a structure. Get off the hog and go down on the little bridge on top of the road where you normally drive by. There should be two doors go on the one on your left and there should be the word rex in bloody letters