Social media influencer Carol (Giorgia Faraoni) and her partner Roberta (Jade Pirovano) are looking forward to their long-awaited, romantic vacation in Southeast Asia. Having arrived on the paradise island of their dreams, the two are in the mood for an adventure. They spontaneously book a dive on a charter yacht. What they don't know is that the captain (Daniel Franchi), who initially seems quite charming, is a psychopath and has dark plans for the couple. It doesn't take long before he leaves the resolute Carol in an underwater cave with only limited oxygen and sharks that are already threateningly approaching, obviously extremely aggressive and hungry. Roberta, meanwhile, is locked in a cabin on the boat. Desperate and not knowing how the other is doing, they must try to escape their dangerous situation in order to somehow survive.