Dokdo / Ulleungdo Approach

Ulleungdo · Gyeongsangbuk-do · South Korea

Ulleungdo rises from the East Sea like a volcanic fortress, its steep basalt cliffs plunging into deep water roughly 120 kilometres off Korea's east coast. This is Korea's most remote inhabited island, and the diving around its flanks toward the Dokdo islets ranks among the most dramatic and least explored in Northeast Asian waters. The volcanic geology delivers extraordinary underwater topography. Columnar basalt formations, hexagonal pillars formed by slowly cooling lava, create walls that look architecturally designed. These columns extend from the surface beyond recreational depths, draped in kelp and encrusted with invertebrate life, like diving alongside the pipes of a colossal organ. The East Sea waters here are among Korea's clearest. When oceanic currents run clean, visibility reaches thirty metres, and the deep saturated blue reflects ocean depths exceeding two thousand metres just kilometres from shore. Pelagic life defines the experience. Schools of yellowtail amberjack sweep along the walls in formations numbering hundreds, silver bodies catching light as they turn in unison. Sea bass hold position in crevices, squid hover in midwater during summer. The most extraordinary encounters involve northern fur seals that haul out on rocky islets and occasionally investigate divers with playful curiosity. The kelp forests are among Korea's finest. Dense stands of Saccharina and Undaria create an underwater canopy sheltering juvenile fish and invertebrates. Abalone and sea cucumber populations remain healthy due to remoteness and the haenyeo tradition of female free divers still practised here. Currents are the primary challenge at outer sites. Drift diving is standard, with boats following surface markers. The approach toward Dokdo intensifies conditions with open ocean currents and unpredictable surge, rewarding advanced divers with the highest probability of pelagic encounters.