Check out this gorgeous mermaid group! It's the world's largest underwater mermaid show that just set a new Guinness World record on Wednesday. Partnering with the Professional Association of Diving Instructors (PADI), Atlantis Sanya – a resort in south China's Hainan Province - had 110 professional divers in mermaid costumes swimming in its 11-meter deep Ambassador Lagoon aquarium, doing various underwater stunts.