Half Life: Blue Shift Easter Egg - The Hidden Rosenberg

When You get to the part where you are about to find Rosenberg, (you will just have used the CO2 canisters to blow the door open), type in these cheats: "noclip", and "R_fullbright 1" without quotation marks and with the "_". Now Fly out of the game and in the distance you will see some rooms/boxes/squares (whatever you want to call them). Go to them (the smaller ones, the big one is empty). In most of them you will see a swat team guy and in the last one you will see another Rosenberg.