In the early morning of 26 September 2004, the Danish trailing suction hopper dredger 'Thor R.', owned by Danish contractor Rohde Nielsen, collided with the construction vessel 'Ocean Ace', while executing maintenance dredging in the navigation channel to the Port of Esbjerg.
The 'Thor R.' was build in 1984 in The Netherlands as 'Whale' for the International Dredging Contractor D. Blankevoort & Zn.
The next day the 'Thor R.' sank and subsequently capsized under water, partially impending traffic into the port. The contract for the salvage was awarded to the Dutch towage and Salvage company Multraship of Terneuzen, which immediately mobilized the 1500-ton floating sheerlegs 'Matator 3'. The sheerlegs -owned by Bonn & Mees of Rotterdam and designed of Vuyk Engineering Rotterdam - was collected in Rotterdam by the tug 'Multratug 7'.
The Salvage of the vessel was complicated by strong tides, which allowed only four hours of diving time per day and by soft sandy bottom, into which the wreck continually sank.
Salvage of container inland barge loaded with construction plating in joint venture with other salvage company. DISA International was tasked with Marine Operations Management aside from supervising diving, rigging, lifting/ refloating operations.
Period: June – July 2006
Location: Antwerp, Belgium