Sea World Explorer is a state-of-the-art semi-submarine developed in Australia for use on the Great Barrier Reef. The vessel does not submerge; you descend into the hull of this cruising underwater observatory and sit in air-conditioned comfort. You embark on a narrated tour of the coral reefs along the south side of the island.

From your underwater cabin, you can clearly observe a wall just offshore that drops sharply to a depth of several hundred feet. You will see dozens of species of tropical fish such as yellow tail snapper, sergeant majors, parrot fish and queen angelfish, as well as delicate colonies of coral that were thousands of years in the making. Then watch in awe as a diver is surrounded by hungry fish hand-fed right in front of your window.