Chapter one "Blind Maze" image - Left Behind mod for Half-Life 2: Episode Two

The year is 2030; 3 years after 4 of the world's most powerful volcanoes exploded and released over 5 Mega tones of ash in the atmosphere. Earth's average temperature dropped below -20 degrees Celsius, due to the ash limiting the sun's exposure to around 10%, thus creating a severe and harsh ice age over the whole planet, leaving lots of people under the snow, and trapped in their basements. The last place on earth that still is warm enough for human existence is now the equator...