Halo, the first one

[Arielle]

Hey,so i'm not a gamer at all. and me and my best friend were staying at my boyfriends last night, we are house sitting and decided to play halo, the original one. And we are stuck on the Silent Cartographer part..We killed everyone there but we just don't know where to find the key or control panel to open the door so we can find the map room. so if anyone can help me! Please do!!! Thanks tons

Arielle!