Mars was damaged last August by Hurricane Katrina, when it was exposed to 175 miles-per-hour (280 kilometres-per-hour) winds for at least four hours.
The platform rig that sat atop the 39,000-tonne structure was toppled, sending the derrick overboard and portions of the rig's substructure crashing down on the topsides.
Last month, Shell removed the rig wreckage as part of a two-phase lift carried out by the Heerema derrick semi-submersible Hermod.
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