Sid
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On the Halo 2 map Coagulation there is a hidden message much like the "Why Am I Here" message in the Beaver Creek level of Halo 2.
Directions
Go into the cave systems above where the Overshield/Active Camoflauge spawns, and in the arch/window look to your left and you will see a message in the rock that says "Not Sid Was Here".
