Hidden Crystal Worlds

Hidden Crystal Worlds
Unique	Yes
Sector Type	Secret
Race	Crystal (race)

You can reach this sector from an unmarked system in the Rock Homeworlds Sector if you have a Crystal crew member (the system will not appear to have a ship or hazard if scanned with Long-Range Sensors). The only way to get a Crystal crew member is to unlock the Damaged Stasis Pod (detailed under the "Ships" section), or to begin the game with the Crystal cruiser.

There is also a bug(?) which occasionally causes you to start in the Hidden Crystal Sector if you ended your previous game in the Hidden Crystal Sector. It is, however, quite rare.