Hidden Depths Diving is a PADI 5 Star Instructor Development Center in Koh Lanta, Thailand, with over 17 years of experience and the island's only PADI Green Star environmental award. Its custom-built speedboat, the Silver Arrow, reaches local dive sites such as Koh Haa, Hin Daeng/Hin Muang, Koh Phi Phi and the Bida Islands in as little as 35 minutes. It offers fun diving, snorkeling, private boat charters, underwater photography, and the full PADI course range from Discover Scuba Diving through Rescue Diver and professional Go Pro training, with small groups (max 4:1 ratio).