The Lembeh strait in the northern part of the Indonesian island of Sulawesi is a unique hotspot of marine biodiversity. Countless amazing creatures thrive in the underwater landscape. Over the course of four years film-makers captured hundreds of hours of never-filmed-before behaviour. Elegant seahorses, thumb-splitting Mantis shrimp, and deadly mino-octopuses are just some of the remarkable creatures they managed to film. As most underwater drama is hidden from plain sight, only the ground-breaking macrophotography in this film can reveal the awe and beauty of life in the Sea of Creepy Monsters.