Dick Willis (with Tim Allen, Colin Boothroyd, Andy Eavis, Pam Fogg, Tim Fogg, Pete Hall, Martin Holroyd, Pete O'Neil and Tony White plus 3 local cavers). November 2000

This was the tenth in a series of joint Anglo-Sarawak caving expeditions to Mulu National Park. New discoveries in Cobweb Cave in Gunong Benerat extended the mapped length from 15.1 km to 26.7 km, making it the second longest cave in the Park, and the fifth longest in SE Asia. Several 'new' caves were found and surveyed, but with increasing activity by illegal birds-nesters, it has become necessary to conceal information about new discoveries.