A maritime disaster off the coast of Yamaguchi Prefecture has left eight crew members dead, two missing, and one injured after a chemical tanker capsized near Mutsure Island on March 20. The South Korean-flagged vessel, MV Keoyoung Sun, was carrying 980 tons of acrylic acid, a highly hazardous substance that poses significant risks to both human health and marine ecosystems.
Unlike oil spills that can be contained with booms and skimmers, acrylic acid dissolves in water rather than floating on the surface. The chemical causes skin burns upon direct contact and is lethal to marine life at measurable concentrations. Japanese authorities now face a complex containment operation as the toxic plume moves with ocean currents through the Kanmon Strait, a narrow waterway separating Honshu and Kyushu that handles heavy maritime traffic.
The capsized tanker remains on its side, partially submerged but not fully sunk. Salvage teams must decide whether to pump out remaining acrylic acid from the vessel or risk additional leakage during refloating operations.
Both approaches require significant time, during which the local fishing industry faces an uncertain future. Catches including squid, sea bream, and pufferfish are now subject to testing before they can be deemed safe for sale. Fishing grounds in the region may remain closed for weeks or months.
South Korea, as the vessel’s flag state, holds jurisdiction over the crew, investigation, and liability matters. Japanese authorities are expected to seek answers regarding the cause of the capsizing.
Investigators will examine potential factors including stability failure, sudden cargo shift in rough conditions, or navigational error near Mutsure Island, a known hazard in the fast-moving tidal waters of the strait. The injured crew member is receiving treatment at a Japanese hospital. The two missing individuals are presumed dead, though no official confirmation has been issued.
The shipping company has not released any public statements, and the names of those affected have not been disclosed. Acrylic acid is commonly transported from South Korean chemical ports to Japanese industrial buyers for use in adhesives, coatings, and textiles.
While the loss of 980 tons represents a single shipment, it will tighten supply and increase prices for downstream manufacturers. The broader economic impact remains limited, but local consequences are severe. Japanese authorities have not declared a state of emergency or issued evacuation orders for coastal communities.
Wind and current data released in the coming days will determine whether the chemical drifts toward populated shorelines or disperses into open water. In the latter scenario, contamination may become chronic, appearing in sediment samples months later.
The incident is expected to prompt regulatory reviews in both Japan and South Korea concerning cargo loading procedures, crew qualifications, and vessel inspection standards. The families of the deceased and local fishermen in Yamaguchi are seeking accountability and action.
