the four meet halla and the droids to find the temple of pomojema, which halla believes to be the location of the kaiburr crystal. they travel through the swampy wilds of mimban, during which they encounter a wandrella, a huge worm-like creature, which pursues them and separates luke and leia from the others. luke and leia hide in a well, down which the wandrella falls, leaving the two trapped. from the lip of the well, halla suggests that there must be an escape route underground, at the end of which halla and the others will rejoin them. luke and leia journey underground, floating across a lake on lily pads, and fending off sea creatures with luke's lightsaber. on the other side of the lake, they encounter the secretive residents of the caves, the coway, who have captured halla, the droids and the yuzzem. to save his friends, luke defeats the coway's champion fighter and thus impresses the tribe. at a tribal banquet, luke senses darth vader, confirmed by coway patrols—imperials, led by vader and grammel, are approaching.