As soon as you start go foward until you can make a right, go down that hallway and make a left. Theres a room that has a ramp thats black, go up that and you can go up another one but don't. Go straight back through the door, and theres a room that is circular shaped and you elevate while walking. After you made it to the top there is a long hallway, you need about 3/4 life to make it (driving). As soon as your out of hallway your outside. Go left and you'll be on the road and police cars, choppers, swat vans, tanks, cars and everyone will be waiting for you. You get health faster than waiting for a tank to roll up underground....