12 Unique Underwater Wonders in Oceania for the American Diver

9. Chuuk Lagoon, Micronesia

Chuuk Lagoon, often called Truk Lagoon, is a sanctuary for wreck diving enthusiasts. Located in Micronesia, this sheltered atoll was a strategic Japanese base during WWII and now harbors more than 60 shipwrecks, along with planes and tanks. Many lie within recreational diving depths, making the “Ghost Fleet” accessible to those with advanced certification. Coral has since colonized the vessels, transforming the wrecks into bustling reefs crowded with lionfish, turtles, and swarms of glassfish. Some wrecks still hold cargo of motorcycles, trucks, or even gas masks—adding to the time-capsule effect. Guided penetration dives are popular, but photographers also marvel at sun-dappled silhouettes from the outside. For American divers intrigued by history, mystery, and marine life, Chuuk Lagoon represents an unparalleled underwater museum.