Ship wrecks tend to be very inaccessible, thus making them a rich store of archaeological information. While catastrophes on land are likely to be built over (or destroyed by elements), those at sea tend to stay there. They are much more difficult to access. Recent technology has enabled greater exploration of ship wrecks. It has enabled us to find out more about ancient civilizations and technology. (For instance, a Greek wreck had a millennias old computer.)
Even with new technology, some wrecks remain difficult to access (such as those in the Arctic.) It can often take considerable effort to find wrecks in order to explore them. Once found, the wrecks can help provide insight, but still require work to answer questions. (What caused an early submarine to sink, killing all the crew?) There are problem many other interesting discoveries can be made exploring shipwrecks.
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