Water....
It's probably unsurprising to you all but the game would be set in the expanded universe though no extensive knowledge should be required.
It starts 44 years after the battle of Yavin in a time of relative peace. But the Jedi masters have sensed a disturbance in the force. Something dark and hungry is hiding in the unknown regions.
The Jedi planned an expedition to investigate and asked for assistance from the galactic alliance which turned a deaf ear, too concerned with its own political machinations to bother with shadows in the unknown regions.
Fortunately the imperial remnant was more forthcoming, they provided an old victory class star destroyer and crew to aid the jedi.
The players can be Jedi, part of the crew or just private citizens who answered the jedi's call for help.
The very first mission however will involve the destruction of the ship's main hyperdrive leaving it stranded in the unknown regions with only it's backup drive avaliable.
From there players will have to find a way to survive, hopefully save the ship and crew and find out what the heck is going on in the unknown regions.