Forgotten mod for Half-Life 2

Objective:
It is the year 2034.
The people that survived the long harsh nuclear war are few, but still too many.
And because of this nuclear war, humanity has to live underground, for the air on the surface
is far too polluted to breath. These small living places are still a few, and it is your
objective to look at an old subway station.
The place as many too were once very radioactive, but no longer.
It is your task to scout this place and tell the others if it is worth living in.

History:
2021. A cold year for humanity. As it was then, when the nuclear war started.
It is that year, that humanity want's to swipe off the books of history. It is that year
that everyone is trying to not think about, forget it.
But the polluted air makes it hard to forget.

2022. Over half of the population on earth has gone missing or have died. Over 60 countries
of the world have been destroyed. Civilians are starting to make suicides, for they don't want
to live in our world anymore.

2023. A good nor bad year. The nuclear war was won. Stopped. But over 4/5 of the earths
population has died. Over 120 countries have gone, and the air is polluted badly. Anyone
taking a single breath of this air is bound to die. And just a few forests still are on
the face of the earh. People have been taking plants over the underground, wich are the only
places to live anymore.

2029. The pollution has been getting worse, people have to go even deeper underground, trying
to save themselves and their plants and everything they own. Fortunately some people have found
gasmaskes, and are trying to copy them.

2030. Gasmaskes have been succesfully copied, and people are selling them for cheap.
It is this year too, when the first explorers went outside, and saw the first mutation.
This mutation was not harmful, though they are still feared.

2031. 3 underground places have been found to be good for living. Two basements and one
subway.

2032. Radioactiviness has been lowering, meaning that many more places are now good to live in,
but still, too few. People are creating a few jobs, like scouts and explorers. Explorers
explore the world to find new places to live. When they find one, a scout comes in and
checks it. If the scout says it's good, new people move there. A few soldiers are made too
for every underground living place. Two guardians at the door (changes every hour or so, so
no one dies of the pollution) to guard for mutants. And some few to guard the people living
there. Only the guards wield weapons.

2033. People invent a armor capable for the harsh enviorment of the surface,some scouts and all
explorers have been given some weapons. Scouts only have sometimes, as the mutants
hardly ever live underground. Explorers need them so they wont have to run away everytime
when they see a mutant. The armor is only given to explorers too, as scouts don't need them,
because the only move in and out.

2034. The biggest underground place has been found. Some old explorers were found at the
entrance though, none of them being from the same place as you. They were shortly after
indentified to be Russian explorers. No one knows how the Russians got there, but a scout
was send in the underground subway. Being too big, he needed more help, and they were send in
right away.