Exploring the waters off Thailand’s picturesque Koh Racha Noi island is like diving in an aquarium! A powder blue surgeon fish darts past, redtail butterflyfish school above the reef and a peacock mantis shrimp scuttles across the coral, showcasing its extraordinary colourations. We’re also treated to a pufferfish feeding display and a close-up look at the beautiful bearded scorpionfish – all in ultra HD.