Chris dove into deep waters to explore the ocean in a way no human ever had. It gave him a feeling of open freedom. He felt like he could go anywhere or do anything he wanted to down here. As he continued to swim, the restriction became far too obvious. Yes, he could do anything or go anywhere underwater, but he was now completely unable to be up on land. The underwater world may be vast, but seemed void of any other intelligent creature. Perhaps why this mermaid had longed to be out. Maybe she was the last one.