A xenomorph infection.
Miners setting out to get minerals.
A normal shift in Chemistry.
Space Station 13 is a paranoia-laden roleplaying game set against the backdrop of a nonsensical, metal death trap masquerading as a space station.
Read more here.
BeeStation Acacia: byond://acacia.beestation13.com:7979
Check out these maps that come packaged by default in the game.