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Historic wrecks are attractive to maritime archaeologists because they preserve historical information:
for example, studying the wreck of Mary Rose revealed information about seafaring, warfare, and life in the 16th century.
Military wrecks, caused by a skirmish at sea, are studied to find details about the historic event; they reveal much about
the battle that occurred. Discoveries of treasure ships, often from the period of European colonisation, which sank in remote
locations leaving few living witnesses, such as the Batavia, do occur as well. Some contemporary wrecks,
such as the oil tankers Prestige or Erika, are of interest primarily because of their potential harm to the environment.
Other contemporary wrecks are scuttled in order to spur reef growth, such as Adolphus Busch and the Ocean Freeze. Wrecks like
Adolphus Busch and historic wrecks such as SS Thistlegorm are of interest to recreational divers that dive to shipwrecks because
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Well known shipwrecks include the catastrophic Titanic, Britannic, Lusitania, Estonia, Empress of Ireland, Andrea Doria, or Costa Concordia.
There are also thousands of wrecks that were not lost at sea but have been abandoned or sunk.
These abandoned, or derelict ships are typically smaller craft, such as fishing vessels.
They may pose a hazard to navigation[3] and may be removed by port authorities.
Poor design, improperly stowed cargo, navigation and other human errors leading to collisions (with another ship, the shoreline, an iceberg, etc.),
bad weather, fire, and other causes can lead to accidental sinkings. Intentional reasons for sinking a ship include forming an artificial reef;
due to warfare, piracy, mutiny or sabotage; as part of target practice; or to remove a menace to navigation. A ship can be also used as breakwater structure.