lobster crack

Lobster Crack is an advanced dive site off the eastern tip of Jeju Island, South Korea, reaching 30 metres in the clear waters where the East China Sea meets the Pacific Ocean. As its evocative name suggests, this site is renowned for encounters with lobsters that inhabit the deep crevices in the volcanic rock formations. The site's topography features a prominent crack or fissure in the volcanic seabed that runs for several dozen metres, creating a natural canyon effect. The walls of this fissure are lined with crevices and holes of various sizes, providing ideal habitat for spiny lobsters that emerge to feed during the evening and night. Daytime dives still offer good chances of spotting lobsters deep within their rocky retreats, their long antennae extending from dark recesses. Beyond the signature crustaceans, Lobster Crack supports a rich community of marine life adapted to Jeju's current-swept eastern coast. The exposed position means stronger and less predictable currents than the more sheltered southern sites, contributing to the advanced rating. However, this current exposure also brings nutrient-rich water that fuels impressive growth of soft corals and sponges on the rocky walls. Large gorgonian sea fans spread across current-facing surfaces, while barrel sponges of considerable size occupy prominent positions on the reef. Schools of yellowtail and mackerel patrol the open water above the crack, and reef sharks have been occasionally sighted by early morning divers. The deeper sections sometimes produce encounters with unusual species carried by the Kuroshio Current from tropical waters to the south. The site's eastern exposure means it is more subject to ocean swells and wind-driven seas than Jeju's southern sites. Dive operators typically access Lobster Crack from the nearby port of Seongsan, timing their visits to coincide with favourable weather and current conditions. Water temperatures range from 14 to 24 degrees Celsius, with the warmest conditions in August and September. Visibility can be exceptional, reaching 20 to 30 metres during optimal conditions.