Barge Reef is a drift dive along Guam's breakwater where barges were dropped during construction in the 1940s, and the wreckage now holds reef growth, sponges, and fish life. The site feels like a moving line along structure rather than a fixed coral garden. Expect colorful soft and hard corals, elephant ear sponges, reef fish, turtles, eels, and octopus around the barge structure. It suits divers who are comfortable with boat access and current and want a photogenic artificial-reef feel.