When your escaping that one place that I can't remember the name of. Instead of riding a Warthog to the ship you can ride a mongoose. The location of the Mongoose is where you see the big explosoin at the start when your escaping. When you see that explosion you go towards the explosion and then you turn left but make sure that you don't fall through the ground, then you see the mongoose just lying there get in it then go and drive! Remember the mongoose is at the start when your escaping in the warthog just turn left after the explosion.
