The Sankisan Maru is a World War II wreck located in Chuuk Lagoon. The site spans depths from 5 to 40 metres, with an average depth of 20 metres. Divers encounter mild currents and visibility ranging from 10 to 30 metres. The wreck features sharp edges and overhead environments, requiring careful navigation and buoyancy control. Due to the depth and potential for entanglement, divers should be aware of decompression requirements and nitrogen narcosis. Access is by boat only. The surrounding habitat supports a variety of reef fish and invertebrates typical of the region. Divers are advised to dive with a guide familiar with the wreck's layout to ensure safety.

The Yubai Maru is a wreck dive located in Chuuk Lagoon, resting at depths between 15 and 36 metres with an average depth of 25 metres. Access is by boat only. The site features an overhead environment requiring wreck-diving awareness due to potential entanglement risks, sharp edges, and limited exit options. Visibility typically ranges from 10 to 30 metres, and mild currents are present. Divers should be aware of hazards including decompression, nitrogen narcosis, and boat traffic. Night diving is permitted at this site. Due to the depth and overhead nature of the wreck, it is suited for intermediate divers. Always confirm current conditions with a local operator before diving.

The Rio de Janeiro Maru is a Japanese armed merchant vessel resting on the seabed of Chuuk Lagoon. This wreck dive sits at depths between 20 and 35 metres, with an average depth of 28 metres. Divers encounter a significant overhead environment within the cargo holds and hull structure, requiring advanced wreck diving skills and precise buoyancy control. Visibility typically ranges from 10 to 30 metres, and mild currents are common. Access is by boat only. Divers must be aware of entanglement risks and confined spaces. Species recorded around this area include Pink Skunk Anemonefish, Blue Dragon, Bluefin Trevally, wrasses, Moorish Idol, rabbitfish, Horse Eye Jack, Staghorn Damsel, Three-spot Dascyllus, and snails.

The Unkai Maru is a deep wreck located in Chuuk Lagoon, Micronesia, resting at depths between 30 and 40 metres. This site is suited for advanced divers with wreck certification due to the overhead environments and entanglement hazards found throughout the structure. Visibility typically ranges from 10 to 30 metres, allowing for views of the hull silhouette. Currents are generally mild, though divers should maintain disciplined buoyancy when navigating the interior. Access is by boat only, and divers are advised to carry a surface marker buoy and a torch for exploring the deeper, darker sections of the wreck. The average dive duration is approximately 40 minutes.

The Fujikawa Maru is a Japanese armed merchant vessel resting on the floor of Chuuk Lagoon. The wreck serves as an artificial reef, with the shallowest structure at 9 metres and the hull reaching 36 metres. Divers experience mild currents and visibility ranging from 10 to 30 metres. This site is suitable for intermediate divers, though penetration of the interior requires a torch and reel due to entanglement risks and overhead hazards. Guided tours and equipment rental are available. Night diving is permitted, offering a different perspective on the vessel. Given the depth and overhead environment, advanced and wreck certifications are required for those planning to explore the interior.

The Betty Bomber is a wreck dive located in Chuuk Lagoon, Micronesia, resting at a depth of 17 to 18 metres. This site is accessible by boat and features mild currents, making it suitable for beginner divers. Visibility typically ranges from 10 to 30 metres, allowing for clear views of the aircraft structure. Water temperatures remain consistent between 29 and 30 degrees Celsius throughout the year. Divers should be aware of potential hazards, including entanglement risks within the airframe, sharp edges on the wreck, and the occasional presence of jellyfish. Full skin suits or light wetsuits are recommended for protection and thermal comfort during the typical 45-minute dive.

The Emily Flying Boat is a Japanese Kawanishi H8K aircraft resting upright on a sandy bottom in Chuuk Lagoon. Situated at a depth of 15 to 16 metres, the wreck is accessible to intermediate divers. Visibility typically ranges from 15 to 20 metres, allowing for clear views of the fuselage and gun turrets. The airframe is covered in coral growth. Divers should be aware of sharp coral and significant entanglement hazards near gun blisters and open hatches. Access to this site is by boat only, with mild currents generally present. Species recorded around this area include wrasses, blue dragon, and various damselfish.

The Kiyosumi Maru is a shipwreck located in Chuuk Lagoon, Micronesia, resting at depths between 12 and 37 metres with an average depth of 25 metres. This wreck serves as an artificial reef, and species recorded around this area include bluefin trevally, horse eye jack, and various wrasses. Access is by boat only, and the site is suitable for intermediate divers. Visibility typically ranges from 10 to 30 metres, with mild currents and water temperatures between 29 and 30C. Divers should be aware of hazards including deep water, entanglement risks, overhead environments, and sharp coral. A torch is recommended for interior passages, and a surface marker buoy is essential due to boat traffic.