Vicar Esta has at this point pulled from his Bag a Continual Flame skullcap -- not the sort of magical skullcap that might interfere with his headband, just some ruby jewelry to light his way -- and is now looking at least the next layer deeper into this pleasant, out-of-the-burning-sun cave. He does not have a huge number of skill ranks in Survival (Exoplanets) but he knows that pleasant little caves are very often inhabited by things powerful enough to hold and take them -- though the victors of typical caves are not usually 6th-circle Asmodean cleric amounts of scary.
Esta is proceeding carefully nonetheless, but in the sense of looking around for dangerous predators as he goes, not so much in the sense of carrying a radiation detector with him.