The second planet in the Calline system was a planet that was tidally locked and devoid of an atmosphere. One hemisphere, constantly facing the sun, experienced extreme heat rendering it uninhabitable, whereas the opposite hemisphere, perpetually in darkness, was frigid like the void of space. A narrow band of habitability existed between these two extreme zones. In the past, the planet experienced significant seismic activity, resulting in a crust permeated with lava caves. The Rebel Alliance considered it as a potential base around 2 ABY, but discovered that smugglers had already established a base there. Given their animosity toward the Galactic Empire, there was a possibility that the smugglers would collaborate and relinquish control of the base to the Rebels.