 The wreck has given archaeologists two major discoveries : the biggest single collection of Tang dynasty artefacts found in one location , the so @-@ called " Tang Treasure " ; and the Arabian dhow , which gives a new insight into the trade routes between China and the Middle East during that period . The treasure has been kept as one collection and , during the excavation , the efforts to preserve the integrity of the site and its cargo have resulted in detailed archaeological evidence . This evidence has given new insight into the construction methods used in shipbuilding , and the items and style of artefacts has revealed previously unknown facts about the trade between the two areas . 
