https://www.youtube.com/watch?v=fSQyDwHqw24
This is Speed Halo by Darth Human. It was one of the most popular minigame maps back in Halo: Reach and has been remade for Halo 5. What happens is that the humans get into a Wraith and go down a ramp with a teleporter at the bottom and gradually pick up speed. You can go insanely fast if you don’t bump into anything. The zombies have to stop them with their Gravity Hammers which is easier said than done since you have to time your swing perfectly or else you’ll get splattered. The round ends once everyone is infected or 4 minutes pass. If you’ve played the original Speed Halo back in Halo: Reach then you might be saying something like, “Why are Wraiths being used instead of Warthogs?” The reason is because the Warthogs go way too fast and they bounce off the walls like crazy which makes them pretty much impossible to hit. The Wraiths are slower and tend to stay on the ground but are still a challenge to stop.