A lone diver awakens at the surface of a vast ocean and begins descending through its waters, moving between open sea, natural caverns, and submerged ruins. Ancient murals reveal that a long-vanished civilization once lived in balance with this ocean. Guided by a great white shark, the diver reaches wells that restore life to the seas, while robotic devices harvest the ocean's energy and threaten the fragile balance that remains. The story is told wordlessly, drawing on themes from ancient mythology.