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Private Notes
As the game begins, Shephard is part of the clean-up operation. After his transport aircraft is taken down by an Alien Aircraft and he is cut off from the rest of his unit, the "clean-up" mission is abandoned and Shephard joins forces with the scattered survivors seeking escape.
Before the first chapter of Half-Life: Opposing Force, a short introduction is shown. As Adrian Shephard and his fellow HECU comrades are approaching the LZ (Landing Zone 117) at the Black Mesa Research Facility, his plane (codenamed Goose 7) is shot down by Alien Aircrafts, along with several other V-22 Ospreys (the first one is codenamed Goose 3). The rest of the opening sequence consists of Shephard continually losing and regaining consciousness, seeing a conflict between the Xen aliens and the Marines who survived the crash.
After the crash of his V-22 Osprey, Adrian Shephard regains consciousness completely in an infirmary, not too far off from the crash site. He leaves the infirmary, learning that the other Marines who had survived the crash had been killed by the aliens. He makes his way towards the extraction point, where he is told via radio that the military forces are pulling out of the facility.
As the battle begins to turn into the Xen aliens' favor, Shephard and the remaining HECU troops begin to evacuate Black Mesa.
Adrian Shephard attempts to reach the HECU's extraction point to escape Black Mesa. He has first eye contact with the mysterious Race X that seems to be collecting humans for study in their world. Shephard reaches the extraction point but is deliberately left behind due to the G-Man's actions.
Adrian Shephard continues his journey through Black Mesa in search of both his comrades and an alternative escape route after being abandoned at the extraction point. After battling Vortigaunts and traveling through a zombie-infested blast furnace, Shephard meets several other Marines from his company who have also been left behind. He joins forces with them as they try to escape from the facility.
After battling through an office complex filled with Vortigaunts, Adrian Shephard and other HECU soldiers' attempt to find and use an old transit system to escape to the Lambda Core. The Black Ops are first introduced in this chapter as well. Shephard comes across them in a hangar where they are loading a rock from Xen into the back of a truck. Adrian then learns that the Black Ops soldiers have been sent to kill the remaining HECU Marines and cover up the Black Mesa incident. Shephard meets up with several other surviving marines and fights the Black Ops, eventually reaching an underground railway system that leads to the Lambda Complex.
Arriving at the Lambda complex, Adrian Shephard sees Gordon Freeman being teleported to Xen. Shephard is also forced to travel through Xen to find a way out of the Lambda complex.
In it, Adrian Shephard finds himself in underwater laboratories where several Ichthyosaurs are being held. After making his way through the labs and freeing a scientist who provides him with information on the area, Shephard is again forced to teleport to Xen and back again to reach a new part of Black Mesa.
Adrian Shephard is traveling between various biosphere chambers and laboratories featuring massive terrariums used to house Xen fauna being studied by the scientists deep within the Sector E Biodome Complex. Eventually, he reaches an older industrial area and picks up a radio transmission from a group of Marines fighting some kind of massive creature.
Details Adrian Shephard's battle with the monstrous Pit Worm blocking his progress in Waste Processing Area 3. Working his way through the surrounding area (littered with the corpses of the Marines who sent the distress signal in the previous chapter), Shephard manages to dump toxic waste on the Pit Worm, killing it and allowing him to access the next area.
Details the fierce battle raging between the Race X creatures, the Black Ops contingent, including several snipers, and the remnants of the HECU in the last hours of the Black Mesa Incident. Adrian Shephard makes his way through the underground canals and sewers of Black Mesa, fighting through a Voltigore nest, and arrives at the hydroelectric dam featured in the first game. Here, a Gargantua has been trapped on top of the dam and several Marines are attempting to kill it. Shephard uses explosives to destroy the creature and leaves the area through the dam's exposed water pipes.
Details the fierce battle raging between the Race X creatures, the Black Ops contingent, including several snipers, and the remnants of the HECU in the last hours of the Black Mesa Incident. Adrian Shephard makes his way through the underground canals and sewers of Black Mesa, fighting through a Voltigore nest, and arrives at the hydroelectric dam featured in the first game. Here, a Gargantua has been trapped on top of the dam and several Marines are attempting to kill it. Shephard uses explosives to destroy the creature and leaves the area through the dam's exposed water pipes.
After making his way through warehouses filled with Race X creatures and Black Ops fighting, Adrian Shephard arrives at an old industrial area of Black Mesa deep underground where the enormous Gene Worm is attempting to come through a portal from the Race X homeworld. Shephard uses mounted laser weapons to blind and kill it; in its death throes, an enormous teleportation portal spreads outwards and envelops him.
Shephard regains consciousness inside a V-22 Osprey, confronted by the mysterious G-Man. As the G-Man talks to Shephard a white flash occurs in the distance, indicating that Black Mesa has been destroyed by the nuclear warhead. The G-Man then informs Shephard that he will be detained "in a place where you can do no possible harm, and where no harm can come to you." He explains this is done since Shephard reminds him of himself but is still a dangerous witness. The G-Man walks into a portal, Shephard is detained and the end credits roll.
