The Arisan was a 14000 ton Japanese ore carrier built in 1974. She grounded on Geitmaren, a patch of rocks a few miles west of Runde, in January 1992 following an engine failure during a storm. At the time she was carrying 150,000 tons of iron ore. 150 tons of bunker oil went ashore on nearby bird sanctuaries, killing several thousand seabirds. The bird population has now recovered. The wreck is in an exposed position and has been flattened by storms so that it almost covers the whole of the reef.