A roller-coaster ride, a life-and-death journey to escape terrifying sea creatures that have come from the ocean floor to infest the Argonautica, one of the largest luxury liners in the world.

From the bottomless depths of the South China Sea, gruesome creatures surface to attack and cannibalise the passengers on a luxury cruise liner. With swift and deadly precision, these voracious serpents swarm through every deck and passageway, devouring all living things in sight, and transforming the vessel into a floating chamber of horrors. For the few terrified survivors remaining on board who are able to elude the bone-crushing forces, a living nightmare awaits them at every turn.