In 2005, when the salvage company investigated the sunken ship in the sea area of Nanchuan Island, it accidentally found an ancient sunken ship containing Chinese porcelain, which was located on the sedimentary layer of the seabed  According to the survey, the seabed sediment of Nanchuan island was formed in 1000 A D  therefore, underwater archaeologists believe that the sunken ship could not be the Conquest that sailed to Nanchuan island in 850 A
According to carbon technology, the sunken ship found in the sediment of the South China Sea was built in A.D. 800.
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