The Emergency System Module is only available if the Valkyrie add-on has been purchased and installed. At least one Emergency System is required for the Grave Riser orange medal. This medal comes with the Supernova update and does not require the Supernova add-on to achieve it. The emergency system can be really useful when you are over-whelmed by enemies, and your shield and armour bars are nearly depleted. It buys you a few seconds to cloak or boost away from the combat area or to just reach a space station and escape your enemies.