Chapter 11. Questionable Ethics [Black Mesa]
We'll go up to the room with the broken animal cages. Kill the sleeping big-eyed dogs. To de-energize the fence, shoot the board stuck in the switch. After that, you can safely open the doors and move forward.
We've infiltrated the genetics lab, where we've already begun studying the alien creatures that recently emerged from the portals. We enter the green room, where in the center of the room, in a capsule, is an upright monster. We crawl under the half-closed door, climbing a small slide along the way. We'll find ourselves in a room with two floors. Here, in the left cell, we'll take the crossbow from the dead guard.
(From the control room, you can see G-Man through the glass on the opposite side of the 2nd floor.)
We move on, passing through the men's locker room, then through the cafeteria. In the cafeteria, you can grab a pizza and carry it to the end of the game to get the secret ending. We'll meet a guard and go with him into the corridor on the right.
11.2. Main Hall
There will be several soldiers in the spacious room; kill them all. Take the shotgun and ammo from the central stand, take the machine guns from the soldiers, and restore your health at the wall first aid kit. Continue down the corridor, enter the weapons storage, and take the shotguns and pistols. (If you're carrying a hat, you can leave it in the hall.) We go to the next lab.
We go down the corridor; there are many laser mines ahead. We enter the double glass doors and finish off two monsters—alien infantry. Soldiers will run out into the corridor. We reach the place where a large device with saws and knives is spinning behind the glass door.
If you continue down the corridor, we'll find ourselves in an office in front of a terrarium with headcrabs. Here, on one of the tables, we'll find an alien weapon—snarks (running, biting crickets).
We can continue down the hallway to recover at the wall-mounted first aid kit and charger. Then, look for a double glass door marked "Lab D" in the hallway and enter.
11.3. Laser Installations
In "Lab D," we need to turn on four laser installations. Enter the first room on the right. Inside, press the red button on the large installation – a thin blue laser appears, directed by mirrors into the central room. Exit this room and go into the corridor opposite this room. In the next room, we find a Tau Cannon, and here we turn on another laser installation.
In two more rooms, we turn on two more lasers, collect a couple of batteries and Tau Cannon ammo. Enter the central room, where all the lasers converge.
Approach the steel sheet near the wall and unplug it from the outlet nearby. Go to the control panel behind the glass and press the button. The laser will burn a huge hole in the wall. Climb through this hole and carefully climb down.
11.4. Main Hall. Return
We'll find ourselves in a room with three scientists who can't leave because of a rotating device with saws and knives. We approach the device, quickly run to the center, and then press the button on the panel on the right. The device stops, and the scientists will lead us to the exit.
In the main hall of the building, a military ambush awaits us. We go inside, shoot the special forces soldiers with a magnum, then with a shotgun. A couple of soldiers will remain standing on the roof; we kill them with a crossbow. We take the grenades from the counter. We leave the building with the scientist.
11.5. Complex Courtyard
There are even more soldiers outside. During this time, you can fire an underbarrel grenade at the spot to the right of the rightmost truck. This will kill almost all the soldiers, leaving only two to finish off, hiding just around the right corner of this building. After defeating them, don't move too far from the building. There are two machine gun turrets on the roof above us. Slowly back away from the building and knock out the turrets with shotgun blasts. Now you can wander around the street, collecting all the first aid kits and weapons.
Enter the tunnel on the right. Kill three more soldiers here. Continue on and emerge on the other side. Exit the tunnels to the surface .
Source: gamesisart.ru