Eiko invites Shin to go out with her as she investigate the abandoned Japanese Coast Guard Deep Submergence Vehicle. Eiko reveals to Shin how Ryo had felt guilty ever since he agreed to consent to a brain transfer for Jun, which explained the appearance of Yuki a few episodes earlier by Shin and Ryo. Eiko also tells Shin of a near death experience that she experienced in college as a nautical diver, and a vision of a light on the bottom of the ocean...