Here are a few reasons why it doesn't make sense. 1) The run is too long. From what Halo Nation said, the Pillar of Autumn was 1.17 Kilometers. Yet the warthog run is over 1.8 kilometers. 2) What is the purpose of the place? Why would you need a large scale obstacle course designed for warthogs in a ship? 3) Why is there no roof in certain areas? In certain areas, like I just said, there is no roof. Why is there no roof in a ship? And it couldn't have fallen in, because there is no debris in the ship, or outside the ship as seen in the cutscene. I'm not going to mention the giant jumps and gaps, and the part where you meet Foehammer where there is no side to the ship because those are pretty obvious.