Chuuk Lagoon is an atoll ringed with reefs and containing a number of populated islands. It is the main population centre of the state of Chuuk in the Federated States of Micronesia.
The Chuuk Lagoon is a major scuba diving destination for divers interested in wreck diving. Chuuk Lagoon was a port for the Japanese fleet in World War II and was attacked by the American navy in Operation Hailstorm on February 16th 1944. The lagoon contains the wrecks of over thirty naval ships and 250 aircraft. Many of the ships still have cargo including medical supplies, armaments, trucks and mines. The most commonly dived wrecks are the: