Survey data for the caves of Thailand is being compiled in Walls. As of October 2016 the project has over 204 km of survey centre-line data.
The cave survey data, including scans of the survey notes, is archived at the Cave Registry Data Archive maintained by the British Caving Association.
The Thailand cave survey data is freely available under a Creative Commons BY-NC (Attribution + Noncommercial) licence.
Follow the instructions at http://cave-registry.org.uk/check-out-instructions to install the version control software and the data is at http://www.cave-registry.org.uk/svn/Thailand/.
84 km of the survey data has been acquired by the Shepton Mallet Caving Club between 2000 and 2015. The rest of the surveys are by Dean Smart and his colleagues (1993-2005 - 45.6 km), the Australian expeditions to Mae Hong Son (1986-1990 - 13.3 km with thanks to John Dunkley and John Brush), Canberra Speleological Society (1997-2004 - 12.4 km), Orpheus Caving Club (2004 - 4.2 km with thanks to Simon Brooks) and the Thailand Karst Hydrologic Project (1983-1984 - 2.8 km).
Back up files of the Walls database and scanned survey notes are regularly deposited with the Shepton Mallet Caving Club in the UK.
I would be interested in receiving ANY cave survey notes to add to the database.
Shepton Mallet Caving Club Surveying Annual Totals