Holmes Reef is a remote offshore site in the Coral Sea, located 200 kilometres from the coast. This complex reef system features walls, pinnacles, and caves, with depths ranging from 4 to 35 metres. Due to its exposed location, the site is accessible only by boat charter and is suited for advanced divers. Visibility is high, typically between 15 and 50 metres. Currents are generally moderate but can be strong, facilitating drift dives. The habitat supports a variety of reef fish and invertebrates. Divers should be aware of hazards including deep water, strong currents, and sharks. The open ocean crossing can be rough, making seasickness medication advisable.

Holmes Reef is a remote offshore site in the Coral Sea, located 280 kilometres from the coast. This diverse location features a mix of walls, pinnacles, caves, and caverns. Divers can expect depths ranging from 20 to 36 metres, with an average depth of 25 metres. Visibility is typically high, between 30 and 50 metres. Due to the moderate currents, surge, and significant depth, this site requires boat access and careful planning. Beginners should remain in the shallower reef sections and stay close to their guide. Hazards include boat traffic, sharp coral, and strong currents. Night diving is available at this location.