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In page Ship breaking:

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Vessels are initially taken to a dry dock or a pier, although a dry dock is considered more environmentally friendly because all spillage is contained and can easily be cleaned up. Floating is, however, cheaper than a dry dock.[citation needed] Stormwater discharge facilities will stop an overflow of toxic liquid into the waterways. The carrier is then secured to ensure its stability.[1] Often, the propeller is removed beforehand to allow the watercraft to be moved into shallower water.[citation needed]