This dive site, Kumomi Ushitsuki Rock, is renowned as the most popular cave diving destination in the Izu region of Japan. Located in front of Kumomi harbor, it features a complex network of caves and caverns formed between and around two prominent rock formations known as Ushitsukiiwa. While no specific historical narrative is provided, the geological formations create an intriguing underwater labyrinth for exploration. Navigation primarily involves exploring these various interconnected tunnels and overhangs.
The vibrant soft coral gardens are a highlight, teeming with a rich array of marine life including dazzling sea goldie and delicate butterflyfish. Venturing towards the offshore sections of the dive site, divers can encounter impressive large schools of chicken grunts, and are often rewarded with sightings of majestic large groupers locally known as 'kue'.
The site's relatively shallow maximum depth of 19 meters and average depth of 9 meters make it accessible for a range of divers. It is particularly appealing for wide-angle photography due to its unique rock formations and schooling fish. Freedivers can also enjoy the shallower cavern areas and rich marine life. Divers should possess good buoyancy control for navigating the cave systems and be mindful of other divers due to its popularity.
