You can open the blast door wrench the flaps under and then walk through in cargo. You can throw things in space to move. You should go to security whenever theres zeds to grab a gun before anyone else.
What are the songs playing 5:25 and 6:46? They both give me a sense of nostalgia but I can't place where I've heard then before. I think the second one might have been in Tony Hawk Pro Skater 2.