Deruk (Hell Beta or Prison {by most Terlizians}) was a inhabited Class-H planet 2.5 ly from Crataxia, and over 1000 ly from Earth. It was the location in which the Terlizians, a philosophically opposed minority, were exiled. In May of 2474, the Terilizians were able to copycat a Crataxian distress signal and attract the USS Inventum in an attempt to escape it [Deruk].