To do this trick you must be in Forge mode and be at Construct. Make sure you sell a respawn point before doing this glitch. Start out as the Oracle. Go down the pink grav lift by using your boost (press LT). There should be a few holes. You cannot fit down these as the Oracle. Start boosting into one of these holes that is not a closed circle. The Oracle should go slightly lower into this hole. Make sure you keep holding boost then turn into the player (either Spartan or Elite). You should fall underneath the level. Make sure you drop a respawn maker on a place where you can stand. This is to allow you to back there whenever desired. To prove you are under the level try to fly up without going through the grav lift. There is an invisible wall just like in the Foundation level in Halo 2, except on the bottom. This may not work on the first attempt.
Lol.
