John left his apartment in his freshly pressed jumpsuit, pure blue. He smiled at the people walking past him as he approached his workplace. Suddenly, the vent hatch on the ceiling was smashed off and out came three ravenous baboons. They all ran in different directions, one jumping on John and clawing at his face. John threw it on the floor and kicked it before running away. He entered the atrium to see about six guards holding off a horde of baboons, many were mauled and eaten. 'Where did these things come from?' John thought.
Just when things seemed to be going better for the security, a large ape appeared around the corner of the hallway that spewed baboons. It howled and madly charged at the guards and tore them to pieces, then went after John. John ran the other way, but the ape pounced on him and ripped off John's skull. Weeks passed of fierce resistance from survivors and the few remaining security, but everything was soon overrun and the Vault was ended.
I think this will be kind of fun to see all these ideas and such. Be creative and put thought into it, happy posting!