The Hong Kong Archaeological Society commissioned Dr Mick Atha to direct their annual research project in October-November 2013. The island of Yim Tin Tsai, Sai Kung was selected for a survey-cum-excavation project designed to locate and characterise the ‘prehistoric’ remains noted by pre-war amateur archaeologists, while also carrying out excavation and standing building recording of a ruined structure thought to have been the island’s former ancestral hall and then Catholic chapel, in which the island’s priest Father (later Saint) Joseph Freinademetz once lived and worked. The ruined building was successfully excavated and recorded, and yielded a number of plaster moulding fragments perhaps relating to its religious phase of use. The survey not only produced widespread evidence of Qing dynasty to 20th century agricultural activity, but also led to the significant discovery of a Han dynasty site—with pottery very similar to that found nearby on northern Kau Sai Chau—right in the middle of Yim Tin Tsai village.