arg. so early in the game! okay..someone tell this loser how to open gate 5. Ive gotten all the other gates open but 5. Ive managed to get the flamethrower from the police baracks area. Also, if I jump on top of the crates in front of gate 5..grab the machine gun..I can jump over the sheilded doorway into the room the radiation room. I end up dying there. someone please drop me some hints here, but try not to spoil it too much for me :P
Don't worry too much about Gate 5 now, you'll end up there later.