The Underwater Observatory tour starts with a relaxing train ride on the Stocker Preston Express along the length of the Jetty with 360-degree views across Geographe Bay. Descending 8 metres below the ocean's surface, this tour then explores the natural wonders that lie beneath the Jetty where it’s piles create Australia’s greatest artificial reef host to 300 different marine species with an inspiring forest of vividly-coloured tropical and sub-tropical corals, sponges, fish and invertebrates. 13 underwater Sculptures have been built to form a snorkel trail for everyone to enjoy.