The towering walls which have been guarding the imposing Jaisalmer Fort and its 90-plus bastions holding the meandering alleyways together for over 850 years now stand on shaky ground. While the increasing water use within the Jaisalmer Fort over the last few decades is being cited as the probable cause, the Archaeological Survey of India has already decided to carry out detailed geo-technical investigations to study the stability of the walls, bastions and slopes of this fort that has been immortalised on celluloid by Satyajit Ray as Sonar Kella. The Geological Survey of India is already camping in Jaisalmer to carry out detailed soil studies and related topographical studies.