The deepest cargo salvage from a shipwreck was carried out by Blue Water Recoveries Ltd (UK), when they salvaged 179 tonnes of blister copper and tin ingots off the wreck of the merchant vessel SS Alpherat from a depth of 3,770 m (12,370 ft). The salvage took place during February 1997 in the central Mediterranean just east of Malta where Alpherat had been sunk by a bomb dropped from a German Junkers 88 aircraft while transiting in convoy during World War II. Blue Water Recoveries conducted the salvage using the dynamically positioned salvage vessel Deepsea Worker and their unique robotic salvage Grab 6000 and heavy lift system.