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Shipwreck
A shipwreck is the remains of a ship that has wrecked, which are found either beached on land or sunken to the bottom of a body of water. Shipwrecking may be deliberate or accidental. UNESCO estimates that worldwide over 3 million shipwrecks, some thousands of years old, lie on seabeds.
== Types ==
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 but only very infrequently.
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 are of interest to recreational divers that dive to shipwrecks because they are interesting to explore, provide large habitats for many types of marine life, and have an interesting history.
Very few shipwrecks are as famous as the catastrophic , ''Britannic'', , ''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〔(【引用サイトリンク】url=http://www.nauticalcharts.noaa.gov/hsd/wrecks_and_obstructions.html?utm_source=Discovery+Diving+Newz+%26+Trivia&utm_campaign=Newz+March+19%2C+2015&utm_medium=email )〕 and may be removed by port authorities. There are more than 3 million wrecks on the ocean floor, the United Nations estimates.〔
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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