So as i was waiting for the video to load on my phone, the trailer started playing on the tv (during the SEATTLE football game lol). At the end of the video i noticed they jumped into a giant cave in the ground. Anyone know what im talking about when i mention The Cave of 1000 faces? Its on the level Sierra 117 in Halo 3. Found it a while back when me and a friend got out of the map. I know many people may know of this but i just thought it was a cool easter egg if that is the cave. Totally blew my mind! :D i love Bungie!
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Maybe the cave is part of the final raid level