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Marine salvage is the process of recovering a ship, its cargo, or other property after a shipwreck. Salvage encompasses towing, refloating a sunken or grounded vessel, or patching or repairing a ship. Today the protection of the environment from cargoes such as oil or other contaminants is often considered a high priority. "Salvors" are seamen and engineers who carry out salvage to vessels that are not owned by themselves, and who are not members of the vessel's original crew. When salvaging large ships, they may use cranes, floating dry docks and divers to lift and repair ships for short journeys to safety towed by a tugboat. The aim of the salvage may be to repair the vessel at a harbour or dry dock, or to clear a channel for navigation. Another reason for salvage may be to prevent pollution or damage to the marine environment. Alternatively the vessel or valuable parts of the vessel or its cargo may be recovered for its resale value, or for scrap. (via Freebase)