Scarab boarding glitch

From Halopedia, the Halo wiki

The Scarab Boarding Glitch is a glitch that can be performed on the Halo 3 Campaign level The Storm. The glitch allows players to board the Scarab earlier.

Walkthrough

Start at Mission Start. When you get to the first Anti-Air Wraith, kill all enemies except the Anti-Air Wraith driver. On Easy and Normal, the anti-air Wraith driver will be busy trying to kill the Hornet. This should give you time to melee off the side "wings" off the Wraith, and hijack it. Drive the Wraith into the next lakebed and kill all enemies.

When you see "Judgment" appear on the screen, save and quit. Then resume the mission. After this checkpoint, do not save and quit.

Position the Anti-Air Wraith where the Troop Transport Warthog is. When the Scarab's leg comes down on your position, press LT to boost; the Wraith will be sent flying into the air. If you get out of the Wraith at the right time, you should land on the Scarab's deck.

This may take a couple of tries, as the Wraith's position is a significant factor; if your position does not get you on top, press the Xbox Guide button and sign out. Resume the mission.

This glitch might overload the level if the Wraith does not move from it's position. The game will start to lag and eventually the Scarab will be removed from the level. Overloading the map will cause everything but the Hornets and Pelican to be removed from the level and sometimes Arbiter will not be spawned.