On the first level of Halo 2 (Cairo station), at the last part of the level where you have to secure the bomb (scene: return to sender). you have to be on legendary with no co-op. You have to have thunderstorm skull (no other skulls active) it must be active before the 1st checkpoint. you cant die, or even lose 100% of shields, you cant revert or quit while trying to find it. If succeeded you will hear this message being broadcasted over the intercom: Paging Meg: please report to the red courtesy phone. Meg to the red courtesy phone