Sullust

Sullust is a volcanic world whose surface is uninhabitable smog and lava - so the jowled, big-eyed Sullustans built their civilization in the cave networks below, becoming the galaxy's finest natural navigators (cave instincts translate). Their megacorp, SoroSuub, employs half the species and once claimed the whole planet.

The Rebel fleet massed near Sullust before the Battle of Endor - 'It's an older code, sir, but it checks out' was flashed nearby - and Nien Nunb of Sullust co-piloted the Falcon into the second Death Star. The planet's liberation from its SoroSuub-Imperial administration followed within the year.