On the Covenant, you can get out of the map and go very deep underwater. To do this glitch, start at Rally Point Alpha and have at least two people in your party. Have at least one person ride the Pelican. After that, use the Hornet missles to push the Pelican past the barriers. Once you are past the barriers, you can jump out of the Pelican and explore around.

Related posts:

1. Halo 3 – Pelican Riding On The Covenant
2. Halo 3 Glitch – Half Infected Brutes
3. Halo 3 Glitch – Extreme Time Travel
4. Halo 3 Glitch – Alternate Cutscene On The Covenant
5. Halo 3 Glitch – How To Go Weaponless in Campaign