Mod:DUST Survival Simulator/The Fall

The Fall is the given name of the apocalyptic event that devastated New Vegas and the Mojave Wasteland, leading to the events of Fallout: DUST. The player can learn the history of the Fall through the many notes, logs, and journals scattered around the wasteland.

Cause
Based on the various journals and logs found around the Mojave, it is implied that the NCR was at least partially responsible for The Fall and its subsequent chaos. While several details remain unclear, it is implied that the Fall was a result of (among other things) the NCR's experiments with the Cloud from the Sierra Madre and the invasion of Tunnelers from the Divide.

Pre-Fall
Twenty years before the events of Fallout: DUST, the Second Battle of Hoover Dam occurred. The NCR, aided by Courier Six, claimed victory over Caesar's Legion and drove them back across the Colorado River. However, the Courier ultimately turned on the NCR (either by order of Robert House or Yes Man) and ordered them to leave New Vegas. The NCR would eventually brand the Courier as a terrorist.

The Beginning of the End
Sometime after the Second Battle of Hoover Dam, the NCR discovered the Sierra Madre Casino, as well as the mysterious and deadly Cloud. It is implied that the NCR conducted experiments with the Cloud, bringing both massive samples of Cloud Residue and corpses of Ghost People back to the Mojave.

What happened next is unclear, but at some point after the Sierra Madre expedition returned to the Mojave, something went terribly wrong. The Cloud began to engulf New Vegas, starting with the Strip and eventually spreading to Freeside. During this time, the NCR set up a makeshift laboratory in the Lucky 38 casino, conducting horrific experiments on innocent civilians for unknown purposes.

Chaos in New Vegas
As the Cloud began to spread across New Vegas, panic descended on the Strip and Freeside. Riots broke out as whole sections of the city were engulfed by the Cloud, killing hundreds. In Freeside, the Kings launched a rebellion against the NCR, but were ultimately broken and forced to flee when martial law was declared. Troopers began to execute innocent civilians in the streets. The Followers of the Apocalypse were forced to abandon the Old Mormon Fort. Eventually, the Cloud became so bad that NCR President Aaron Kimball ordered an evacuation of all citizens of New Vegas

The city would ultimately fall to the Cloud. While some survivors managed to take shelter in the Strip's now-abandoned casinos, many citizens were not so lucky. Those who weren't immediately killed by the Cloud became ghouls or Cloud Victims, while others died slowly of radiation poisoning and Cloud exposure.