 In December 1959, construction workers digging west of Dahuting Village in Mi County (now Xinmi), Henan Province, encountered the southern limits of two subterranean tombs built of stone and brick.The Institute of Cultural Relics of Henan Province excavated the two tombs, designated M1 and M2, from February to December 1961.Subsequent excavations of the area beginning in the autumn of 1977 revealed nine satellite burials surrounding M1 and M2.