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In page Ship breaking:

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Large objects, such as engine parts, are extracted and sold as they become accessible.[citation needed] The hull is cut into 300-tonne sections, starting with the upper deck and working slowly downwards. While oxyacetylene gas torches are most commonly used, detonation charges can quickly remove large sections of the hull. These sections are transported to an electric arc furnace to be melted down into new ferrous products, though toxic paint must be stripped prior to heating.[5]