In 2004, a total of 8.6 million passengers arrived in Hong Kong from the Mainland and Macau by sea and by helicopters. They were processed at the China Ferry T"erminal in Tsim Sha" Tsui and the Hong Kong-Macau Ferry Terminal in Central. In addition, a daily average of 49 helicopter flights between Hong Kong and Macau are operated at the Hong Kong-Macau Ferry Terminal. Four Customs launches conduct maritime patrol in the territorial waters round the clock whereas four high-speed pursuit crafts and two shallow water patrol launches are employed to carry out interception at sea.