The resource value of the matter (gas and dust) inside the nebula is incredibly rich, leading many a traveler and explorer to wander inside its boundaries in hopes of harvesting their way to fortune. Many entered, but none returned due to the attacks of a race known as the Kadeshi, relatives of the Kushan. They roam freely inside the reaches of the Great Nebula, never leave its protection, and protect the nebula as a sacred and holy garden. They believe that any outsider venturing into the nebula defiles it. This lifestyle is made easier by the fact that the Nebula's energy levels are so high that even the Mothership's sensors had difficulty to compensate, letting the Kadeshi ambush them when they passed through.