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Abstract:

Two expeditions of 6 and 10 persons plus local logistical support visited Thailand in May 1985 and April-May 1986. A total of about 12km of new cave was discovered and over 20km of surveying carried out. The two longest caves on the mainland of South-East Asia, Tham Nam Mae Lena and Tham Nam Lang each reached 8.4km. These two caves aggregate 14km of superb stream passage, exploration of which was undertaken and some significant archaeological sites requiring further investigation were located. During the period 1983-1986 six expeditions visited the previously unreported karst and caves of Nam Khong basin in north-west Thailand. Two of these were moderately large endeavours: in 1985 six cavers spent 9 days in the field, in 1986 10 members were 18 days in the north-west and a further 10 in central and South Thailand. Exploration and surveying has been the main theme of the expeditions. About 100 caves have been explored, and a total of nearly 26km of caves surveyed. A scientific research program commenced in 1986, covering geology, geomorphology and archaeology and we expect this to continue in future years. One paper has been published, three more are in press or preparation, and we have completed a 62-page report on the expedition.