The San Francisco Maru is a technical wreck dive located in Chuuk Lagoon, resting at depths between 46 and 63 metres with an average depth of 56 metres. This site requires boat access and offers consistent visibility of 30 metres. The wreck presents a full overhead environment with significant entanglement risks and sharp edges. Due to the depth, this site is suitable only for experienced technical divers holding deep and wreck specialities, with trimix training strongly advised for sections below 50 metres. Water temperatures remain stable between 28 and 30 degrees Celsius throughout the year. Divers should monitor depth carefully and remain vigilant for boat traffic during surfacing.

The Nippo Maru is a Japanese fleet wreck sunk during Operation Hailstone in 1944, resting in Chuuk Lagoon. The site lies at depths between 21 and 50 metres, with an average depth of 32 metres. Access is by boat only, located 5000 metres from shore. Divers encounter mild currents and visibility ranging from 10 to 30 metres. The wreck features overhead environments and sharp structures, requiring advanced certification and careful buoyancy control. Divers should carry primary and backup torches for hull penetration. The habitat supports various reef fish and invertebrates typical of the region. Hazards include deep water, entanglement risks, sharp coral, and the presence of sharks.

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 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 Heian Maru is a large Japanese submarine tender resting in Chuuk Lagoon. This wreck lies at depths between 20 and 36 metres, with an average depth of 23 metres. Divers access the site by boat, where mild currents typically prevail. Visibility ranges from 10 to 30 metres, allowing for views of the hull structure. The site features penetration opportunities, though the overhead environment requires proper wreck training and a dive torch for dark interior passages. Due to the depth and wreck structure, this site is suited for intermediate divers with appropriate certification. Local operators provide guided tours, air fills, and equipment rental.

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.