When you're under an ocean made up of mostly liquid oxygen (and a bit of nitrogen), you get a driveable racing track under the sea. Flash forward and fear the ferocious flounders!
This map is meant to be played going to the left at the start, however, you can go right, but beware its difficulty. I really haven't done forging much since Reach, so don't flame if your spartan's mongooses' wheels fall off from the bumps on the track, because i'm not into all the new forging techniques. You could let me know if you know of any way I could get the track any smoother, and I'll post an update if I get it worked out.
My Gamertag is: "The Bear Clawz"