The most scenic region in all of Halo 3 also happens to be one of the most difficult areas to access in the entire game. Surrounded by barriers, the hidden waterfall area is over 1,000 feet below the playable area.

Game: Halo 3
Mission: The Ark
Difficulty: Any
Skulls: Bandanna, Tilt, Cowbell, Boom (optional), Acrophobia (optional but convenient)
Players: 2+

Discord:   / discord  

Music Courtesy of Karl Casey @WhiteBatAudio (in order of appearance):
Be Quick or Be Dead
Aggressor
Hellraiser
Klendathu Drop
Metalogic
Glitch in Reality
Titane
Metalogic