Truk Lagoon is a remote, advanced wreck-diving destination built around numerous WWII-era ship and aircraft wrecks inside a protected lagoon. Most dives are boat-led, and many wrecks can be penetrated or explored as living artificial reefs, with coral, sponges, sharks, rays, turtles, and dense tropical fish around the metal and cargo. It is a history-heavy, operator-dependent destination where buoyancy, lights, and planning matter as much as the site list.