SALVAGE teams from Smit Tak Rotterdam and Singapore, together with two other salvors, have completed the salvage of the OHI 5000 - the world's largest ocean-going single-crane ship (pictured above). The huge vessel was redelivered to its owners in a drydock at Ulsan. The OHI 5000 was the result of a nine-month project converting the 1,800-tonne heavy lift crane ship DB Sarita into a vessel with a gross lifting capacity exceeded only by four semi-sub, twin-crane derrick barges. The OHI 5000 had completed her sea trials and had been handed over to OHI of Singapore only a few months before Typhoon Seth struck the Korean coast. The vessel broke its moorings on October 13. It was driven against the quay at the Hyundai yard and later went aground. The vessel suffered extensive underwater damage, with the loss of much shell plating. The engine room and 17 of its 20 ballast tanks - some converted into workshops - were flooded. Smit Tak manager Geert Kofferman said: 'We formed a working partnership with two other International Salvage Union members - Jinil and Nippon Salvage - to respond to this emergency.' Smit contributed a salvage master, a naval architect and seven other members of the joint salvage team. A considerable programme of work was required prior to the OHI 5000's redelivery. This included pumping, welding and patching on a major scale. Tanks were de-watered and pressurised, booms were deployed around the vessel and a variety of pollution prevention tasks were performed, including skimming in the engine room and other spaces. The vessel was also lightened by removing its 1,000-tonne and 300-tonne cranes. The team's efforts were rewarded with a successful refloating of the OHI 5000 on November 14.