The Yonaguni Monument, often referred to as the 'Submarine Remains,' is an extraordinary underwater rock formation located off the coast of Yonaguni Island in Okinawa Prefecture, Japan. This massive structure, measuring approximately 250 by 150 by 25 meters, is characterized by its angular shapes, terraces, ledges, and steps, leading many to speculate whether it is a natural geological formation or a man-made ancient ruin. Its mysterious origins make it a significant site for both geological study and archaeological intrigue, drawing divers from around the world.
Visitors consistently highlight the monument's unique and awe-inspiring nature. Reviewers describe it as 'unbelievable,' 'mysterious,' and 'one of the weirdest places on earth,' emphasizing the profound sense of wonder it evokes. The visibility at the site is frequently praised, with some divers reporting over 30 meters of clear water, allowing for excellent views of the formations and marine life, including turtles and schools of fish. While some note a lack of abundant fish compared to other dive sites, the monument itself is the primary attraction, offering an 'interesting dive nonetheless.' The debate over its natural versus artificial origin adds to its allure, with many divers finding themselves pondering its history during their exploration.
For those planning a dive, it is crucial to be an experienced diver, with some suggesting a minimum of advanced diver certification. While currents are generally manageable, some reviewers mention 'swift currents' and 'swell' at the surface, advising a negative entry into the water. It is recommended to spend sufficient time exploring the various features, including the 'twin towers' and 'carvings.' Bringing an underwater camera is highly recommended to capture the unique formations. The best time to visit is during periods of good weather to ensure optimal visibility and calmer surface conditions, though some visitors have reported good visibility even on cloudy days.
Access to the Yonaguni Monument is exclusively by boat, typically arranged through local dive shops on Yonaguni Island. There are no direct public transport options to the dive site itself. Visitors must first travel to Yonaguni Island, usually by plane from Ishigaki or Naha, and then arrange a dive tour. Local dive operators, such as Sou-Wes, are frequently mentioned in reviews for their services. It is advisable to book dive tours in advance, especially during peak season, to secure a spot and ensure a smooth experience.
A common complaint, particularly for those prone to seasickness, is the motion of the boat, especially when descending into the bottom of glass-bottom boats if not diving. Divers should be prepared for potential surface swells and currents, which can make entry and exit challenging. Choosing a reputable dive operator and communicating any concerns about seasickness or diving experience can help mitigate these issues. Staying hydrated and taking seasickness medication before the trip are also practical tips.
