Nao Yoshigai and Hirofumi Naka-moto go on an adventure to explore the sea, equipped with their cell phone cameras and wetsuits. In a deserted cove, they dive into the waves to capture the beauty of the landscape. At nightfall, they discover the iridescent creatures that illuminate the waters with a magical glow. Full of enthusiasm for these discoveries, the two filmmakers blend in with the underwater life, creating a dialogue between their artificial lighting and the luminescence of plankton and jellyfish. With their unreal shapes, a crab, a starfish and a strange sponge become the messengers of the hidden mysteries of the ocean. Under the guise of an amateur vacation movie, Night Snorkelinginitiates a discussion on our relationship to the otherness of nature. By showing these mysterious and surprising organisms, the film questions the complexity of our planet and our ability to interact with it.