Securing a lift bag

Large heavy objects are lifted from the wreck site by the use of huge "lift bags." The bags are filled with diesel fuel, which is lighter than water, giving them buoyancy to lift a weight of up to 3 metric tons. Once the bag is pulled to the bottom with ballast weights, it is then attached to the object to be recovered and its ballast is released, allowing the bag to float to the surface with the object in tow.

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