On the PSP version of Hoth if you get on a Speeder and go to where the second base would be on the Hunt gmertypes you will notce that the tranches and hangers are there but not fully loaded. You can fly through the Hanger ( same thing with the trenches but this is much easier to fit a speeder through ) and you will be under the map and don't worry you can always go back to the battle by going up and fly through the ground but beware flying to the hanger with speeders you will die