A sudden noise

The further he went, the more relaxed the dog became. He had not yet detected any signs of bears in the cave, thankfully. Perhaps he was overreacting. This moment of serenity was short-lived, however, as a sudden sound came from the depths of the cave. It was a dog, and it was barking at something. The noise seemed to rattle something inside the dog, and it began to bark again.

The bottom of the cave

The dog ran ahead of him, out of range of his flashlight, and Mark had no choice but to follow it blindly. He was tired of this, but he had no choice in the matter. He hurried into the cave, hoping this dog wouldn’t give him any trouble. After a series of turns, Mark finally found the dog. They had reached the bottom of the cave, and to Mark’s relief, there were no bears or anything else at all.