Campaign Creations

Hey, I'm having a bit of a problem with chapter 10. Right after releasing the zerg with the scvs, I get into the vehicles in the hangar but I am unable to go anywhere. The vehicles cannot leave via the stairs and there seems to be no other way out. Am I missing something?

You have to get the vehicles up the stairs, then take them right into a new area of corridors. There was a locked door there previously that should be open once you take over the vehicles.