Lost Valley was so named because it was lost for over ten years — the line-ups and coordinates went missing, and no dive boats visited until it was rediscovered on a drift dive in the late 1990s. The deeper wall sites in the High Rock region experience current more often than others, but a drift dive here is an unbeatable way to see not only the pinnacles but also the sections of wall between dive sites that far fewer divers have explored. For those new to drift diving — don't be alarmed; the crew will explain everything and you will quickly discover there was nothing to worry about.

As with all High Rock's wall dives, Lost Valley has pinnacles that are a joy to explore. Schools of Blue Tangs flow in formation along the reef and simultaneously dive down to graze on algae — the synchronicity of their movement is remarkable. Large Grouper are a common sighting on the edge of the wall, and with a slow and gentle approach, you may catch them with mouths open and gills flared as tiny cleaner fish go to work. Even fish have their morning routines.